I guess I shall share some thoughts as well, since they seem to differ quite a lot from some of those presented above haha! For context, I have been semi casually playing this tier for a bit but was also the main builder for our SS UUBPL slot, save for one team we stole from FC. Jojen ended up going 4-2, only losing to a speed tie and some pretty awful luck in terms of paralysis and crits in a drawn out pp-war, so I do feel that I'm at least semi-qualified to share some thoughts here.
I think the meta is in an incredibly balanced state, and have relly enjoyed getting to play it and experiment with it over the past while. I love how balance-centric the tier is, but still having room to safely delve into more offensive structures (though Hyper-Offense is incredibly matchup fishy, as it should be). There are definately some mons that put a strain on this balance (which I will get into later) but I truly don't see a need to remove any aspects of this tier as it stands currently.
The Pink Blobs

I think these three are incredibly stabalizing things that hold this meta together in a very good way, and based on UUBPL usage I think those stats would agree with me. The development into Clefable especially has been super interesting, as it provides one of the most consistent ways to check the fightings, while having a semi-positive matchup into both Chansey and Giratina Origin (and arguably Slowbro depending on the set you run, you can at least knock it or force recover pp). It offers great role compression through status, being a fairy type, knock, or even CM value which I think was it's most underexplored tool in UUBPL. I think you could argue that how common it is somehow reflects an unhealthyness present in the fightings of the tier, but I think Clefable just has too many valuable tools that would lead it to being used anyways, similarily to how it has found usage in SV despite the meta being incredibly hostile to it on paper - its just that here the meta is just very good for Clefable to thrive. On paper it's winrate wasn't the best, but the formula does not account properly for mirrors, of which there were a few.
Slowbro and Chansey I have less to say about, they are fantastic at being physical and special walls respectively, whos access to pivoting and team supporting options is huge when it comes to the long term gameplans many SS teams rely on. The issue these two have is that if piloted poorly, they do leave teams vulnerable to things like Urshifu or DD Reshiram, but that is more to show how important proper piloting is in a meta like SS where unskilled play can be punished ridiculously easily due to how much small things matter in the games of attrition this meta can lend itself to. Chansey has a lot of move variation I find, where depending on the team its ability to be Hazard setter, Cleric, Toxic wall, Pivot, etc is quite useful since it has the added effect of freeing up your other defensive mons depending on how you approach the team.
The Fightings

I firmly believe these two are sidegrades of each other, where they both perform very important and somewhat similar roles on a team but go about it differently with their own unique perks. Urshifu's Dark type and Wicked Blow does give it the edge over Zamazenta when it comes to matchups vs Giratina, NDW, and Slowbro. Its quality as a Scarfer is really nice, and setup sets can still opt for Sucker Punch as a form of speed control. I don't think it can really run banded because of how disadvantageous the speed tier is vs other scarfers, Zama, and Naganadel, but that doesn't take away from Urshi's raw power anyways.
Zamazenta on the other hand capitalizes on its insane speed and vast slew of coverage moves that lets it pick and choose what it wants to be its defensive checks, being able to run Psychic Fangs to destroy Nagandel, Play Rough to hit Dragons, Crunch to hit Gira-O and Slowbro, Wild Charge for Moltres/Slowbro, the list is honestly pretty extensive. It's speed also lets it run more versatile setup sets compared to Urshifu, at the cost of Wicked Blow being as powerful as it is. Zama itself also provides a soft check to Urshifu if its piloted well.
Ultimately, I don't think either of these largely negatively impact the metagame. It makes sense in a meta where the main resists don't have good matchups into the fightings that you would have to dedicate more resources to managing them. I personally find Zamazenta to be the more threatening but harder to build around option of the two, because Urshifu's pivoting makes slapping a choice scarf on it a pretty great addition to most teams. I do think Buzzwole is just... kind of bad? Idk. But I feel that with how physically oriented this tier is through Melmetal, Physical Gira-O, these two ofc, etc that most teams should be able to defensively handle these long term. They are both strong enough that they are some of the best pokemon at forcing misteps in sequencing (along with 2 others I will get to later) but I think prescenses like that are always going to exist in a tier like this.
The Top 1 + also Solgaleo

This is probably the largest disagreement I have with the community at large, where to me Solgaleo is not only not in contention for best pokemon with Giratina, but I don't see much justification for it being much higher then A- at best, but would personally probably put it at B. I think Solg completely fails at being anything close to a Naganadel answer, its a fine response to 2/3 of the pink blobs in Clefable and Chansey I guess, but as a Defensive Pivot Slowbro just kind of clears it. As a steel it also just doesn't answer the other dragons where its just a sitting duck into Gira, Reshiram, and arguably Dialga when it does occasionally show up. It also doesn't answer either fighting type well, so I just don't see the vision. I think there are much better ways to engage with the pink blobs without running something that loses if it gets burned by slowbro.
Giratina on the other hand finds itself as one of the better just "do everything" mons in the tier, being a great Physical and Special breaker while also having excellent status options, not to mention the fact that its one of the best phasers and has good priority. I think it deservedly earns its place as the best mon in the tier, I'm not sure I would go as far to say S since while I think every team should prep for it I don't think it's remotely mandatory on every team. Either that, or my VR looks like S containing Gira O and Chansey, with S- containing Zama, Urshifu, and arguably Clefable. More thoughts on that later, but Giratina is one of the other biggest "error forcers" I've seen due to how punishing its damage can be, or losing a defensive piece to status if you assume offensive.
"Broken" Things

Naganadel has obviously already been tested and wasn't banned, which I do agree with. I think its not the biggest culprit in forcing errors, however you do notice this a lot in matchups where Chansey and Solgaleo are forced with the weight of checking Naga with Hazards up. I think its speed is super valuable for the tier, and like how it is also a great offensive spiker and pivot. Scarf is a pretty cool set as well, and was something I passed Jojen because a powerful scarfer that 1v1s Zama and Urshifu is super valuable. Its frailty is its downfall, as if left low enough it no longer is able to threaten Giratina, and this is a somewhat common occurance. Keeps it in check!
Reshiram is a hot point of debate right now, and I get why but I disagree for a few reasons. Yes, it is strong but its ability to force errors is definately one of its defining factors especially due to how Chansey is most player's go-to answer, but as I mentioned before with Shifu/Clef I think that one of the big things with balance-heavy metagames is understanding how important resource management is. If your Chansey does not carry T-Wave or Toxic, are you sure that it is something you can use to make ensure Reshiram doesn't spiral out of control if it is DDance? What can you do to limit its entry oppourtunities if you think it is? Fire Dragon will naturally run through a lot of this tier just because of the mons in it, but we are not without options. I think DD reshi is very high risk high reward, and it will consistently reward players when their opponent does not manage resources properly, it has a bad defensive typing and offensive spreads leave you more vulnerable to pretty much the whole tier. It has broken aspects, but I would be more inclined to say that this is one of those "skill issues" that the kids like to point out (I turn 22 in 4 months, I suppose I can say that).
Other Thoughts
SS Ubers had a decent amount of back and forth with CSR, including a late suspect test right before SV that resulted in no action. I feel like, in general, mons that feel like they require specifc checks on all teams are something that need to be looked at.
I do want to respond to this, as honestly while CSR did get tested I think the approach that teams required Yveltal because CSR existed in the format isn't the most nuanced way to look at it, as it completely ignores how powerful Yveltal was in its own right, where in SS nowadays Yveltal having almost universal usage while CSR is not only much less common, but has had lower winrates in recent tours as well. It's power comes from its ability to runaway with games through forcing errors or specific damage benchmarks in often long drawn-out games, but always having the potential to end a game quickly if not responded to properly. While CSR is obviously an extreme example, I think this is to be expected of any metagame, especially one that is characterized by a polarization between balance as a very dominant playstyle with some intermittent incredibly powerful sweepers. Every metagame is going to have those skill-check high risk, high reward mons (and it is also worth mentioning that DD reshiram had a 0% PL winrate).
I think this metagame is super interesting, and there is still so much room to optimize how balance is built! Mons like Torn-T, Dragapult, Pex, even Lugia feel very under-utilized and I feel like as the tier goes on it will gradually become one of the more interesting uubers generations. I don't think any action is needed right now, and will absolutely be participating in any suspect to continue to voice that opinion in a place where it matters a bit more. I'm excited to see how the tier develops, and look forwards to the current ssnl and SS cup later in the year!