Considering I threw my thoughts out when the meta was in its early stages, I'll say a little more here on the patch, what lead to the patch, and my thoughts regarding everything. (I may be wrong about some of the problems individual mons were causing, due to weird matchups/inexperience.)
As Jump noted, the pre-patch meta was unhealthy, with most of the nerfed mons above being responsible in some form.
Drakkrab was the obvious one, as it could run Swords Dance + Weak Armor to outspeed and one hit KO the entire meta, provided it actually managed to hit it's Cross Chops or Stone Edges. Without Weak Armor, it's now only slightly above average in speed, and every decent team should have a mon capable of checking it offensively. I haven't tested it yet, since the release of the new patch, but it should still be good.
Muerekrot was in some ways Drakkrab-lite, and thankfully it's seeing a nerf as well. It neither outspeeds nor OHKOs the entire meta, but after a single swords dance, it was close on both metrics. You could survive the sweep without preying for luck, unlike Drakkrab, but it inevitably left the opponent's team in shambles. Even bringing the sole mon to resist it's dual stab wouldn't save you, because that just meant there was another Muerekrot on the field. (Also, I heard it had pursuit for that.) Anyways, now things will actually be surviving it's hits a lot more often.
Snipythic wasn't quite as potent of a sweeper, overshadowed by the former two since it lost to both. Snipy actually had counters and checks, in theory. In practice, it either cleaned up for Muerekrot, or waited until all of it's checks were too broken to deal with it. Dealing with all of its checks was fairly easy, since it didn't actually need them gone, simply weakened. This was further reinforced by it's immense bulk, when considering the contact damage reduction and calm mind boosts that made the vast majority of the meta remarkably ineffective against it. Removing the defensive part of Phase In, along with the moveset changes and stat nerf makes it far easier to deal with. This is partially because it is simply weaker, but also because it can't cover the whole meta with it's coverage anymore providing more time to beat it down, and partially because you can now meaningfully smack it on the physical side for meaningful damage with Knock Off or some other contact move. (Also, it was weirdly viable on rain? Like, a slow start-esque mon doesn't feel line it would be good on rain. And then you get hurricaned.)
Dracolition was another problem pokemon, but not in the same way as the previous three. DDance was a problem, but on a mon with 40 speed it wasn't exactly getting out of control quick. However, Dracolition was incredibly useful even if it wasn't running dragon dance. It's defensive typing and statline was phenomenal, especially for the amount of offensive tools and utility options it brought to the table, including intimidate, spikes and rocks. It was not the overwhelming force Snipy and Muere were, but it was too much, and could suddenly become a lot too much if it got a dance or two in. I personally disagree with the HP nerf, but DDance needed to go.
Bjorniorite is the last of the mons recieving major nerfs here, and it's fairly simple. Brittle crystals proccing on every attack made it impossible to keep rocks off the field. However, Pixelate Rapid Spin from Mega Bjorniorite was equally unstoppable, and the only way to stop it was to bring in a mon that threatened to KO Bjorniorite before it had the chance to spin. It's not the tier's only form of ate-spin, and there are defoggers, but Furumo can't reliably spin more than once, maybe twice. The defoggers are also not great at hazard removal, so Bjorniorite had an unpleasant stranglehold on the hazard metagame.
These 5 were the big offenders, alongside Lytlegai spreading Paralysis everywhere. Glad to see all of them cut down in some regards. I'm relatively certain all of them will remain, at bare minimum, useable. but we'll see how it goes. Regarding the Buffs, I think it will be nice to see a bit more of Hurstyr and Gravalley (both low tier pre-patch, especially Hurstyr) and Bicunnin is just generally looking to be a good addition to the meta. Wyrmdelse is still bad, though.
As for the other mons changed here, Hulvine is very much going to be hurt, but that's probably fine. Strigpyre also could use the nerf, because it was likely just a problem waiting to appear, especially considering the synergy between flip turn and its ability. As for the last mon, Noirpeck is just being reverted to it's old state which is honestly kinda funny.
That's about it for me. Go Azumarill!
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