Let me preface this by saying that regardless of what is decided, I am sure that the Tiering Admin and by extension the TD Team are absolutely holding the best interests of the tiering policy and the tournaments in question within their final decision, and I believe that this is an issue far greater than their individual selves. However, I personally believe that this proposition is incredibly misguided and just honestly makes no sense.
Perhaps the biggest and most unbiased reason to keep the status quo as it currently stands is the fact that Ubers is, by definition, a core metagame. I don't mean that officially or in regards to whatever bullshit pidgeonhole the tiering policy might sort my tier into, I mean it in relation to the identity that has been forged within the tournaments, their players and Ubers from all these years of inclusion. From past Smogon Tours featuring Ubers in some capacity to team tours in SPL/Snake Draft slotting Ubers into their body of tiers and finally Grand Slam featuring Ubers as one of the 5 stepping stones towards the trophy, the tier has been ingrained into official tournaments for years now, boasting a very healthy and solid mixture of quality "tier mains" (an awful term but I suppose it fits the overall idea of the thread) and skilled tournament players who pick up the tier for tournament purposes. Regardless of the recent Ubers bashing fad, there has historically been a big connection between tournament players and Ubers, with most of the older generations of the tier seeing most of it's players from established tournament veterans, simply because of how much it has always been present in Smogon tournaments. To take something that has been an integral part of this identity should always require an overwhelming amount of support, because swapping out the status quo on something that has been so solidly proven in the tournament circuit for so long for something so uncertain only makes sense if the community is hell-bent on driving out one of it's truly core metagames, and I just don't see that.
There still is clear shock towards the Mazar cheating scandal (which fyi has no bearing on the tier but people seem to combine them together due to ignorance or whatever other reason) or maybe people just hate seeing the vocal and controversial STAG clan as a part of the community (which is just another awful circlejerk that has grown on Smogon and should in no way represent the Ubers community as a whole) or maybe they'll even point towards the prolonged stay of Shadow Tag or Gothitelle within the tier as a reason to discredit Ubers in general, but the truth is, there is absolutely no objective reason that Ubers should be getting essentially purged from tournaments or Smogon "officiality", if you will. There is nothing inherently problematic with Ubers, when comparing it to other lower tiers. It has it's own tiering philosophy and identity, it has an independent yet still connected playerbase that is currently blossoming with new talent ever since the arrival of Ultra Sun and Moon while still retaining it's tournament veterans and older roots, it is an extremely balanced and playable tier with room for creativity and deviation and has an extremely active and dedicated body, with a substantial ladder community and PokemonShowdown! room presence, a very competent moderation/QC/VR team and one of the best Tier Leaders on the website running all of that. There is absolutely nothing to point towards that could even begin to paint Ubers as a more unstable or uncompetitive tier than the other lower tiers, while they are plagued by usage stats dictating their paths, Ubers might experience different problems, mainly the dilemma of having to deal with the consistent influx of too powerful Pokemon while still keeping an interesting and healthy metagame. Just because it behaves differently and experiences other issues, that shouldn't be grounds for expulsion, surely?
All in all, it always interests me whenever the debate for excluding Ubers from something comes up, because it's always a recycled collection of poor and ignorant arguments, focusing on all the irrelevant aspects rather than actually pointing to the tier itself and the people who play it:
Ubers on the other hand has been part of the tournaments circuit for long while, but in recent times people feel the tier has lost its identity, that the tier has either stagnated or gotten worse (it definitely hasn't seen any sort of improvement), that their tournament playerbase is particularly troublesome (talking about prominent names, not randoms). It would be easy to pin down those problems on their lack of SPL representation, but they aren't recent issues and actually were some of the major reasons why it wasn't included.
Ubers being a part of the circuit for so long should count in it's favour, and I already explained why in my first point so I won't delve into that once again. The second line is what interests me the most. How has Ubers "lost its identity" recently? I would really like to see some more explanation as to that point, because all it screams right now is official-sounding unsubstantiated parroting, and that is my biggest issue with all of this. Onto the next claim, it's perfectly fine, albeit extremely biased, to say that the tier has gotten worse, but what doesn't make sense is saying that it has stagnated. SM Ubers was an undeniably stagnant tier, corroborated by the past Snake Draft and Grand Slam tournaments, but maybe it didn't have enough time or room to develop? Nonetheless, USM Ubers is one of the most dynamic and ever-changing Ubers metagames we've seen in years, with new arrivals completely shaking it up and new ways of playing it popping up with every tournament we host (from Seasonals to UPL to a future Slam/Snake/SPL). It might not be everyone's cup of tea to see "the lion" running around with sets ranging from ultra-offensive to uber-bulky, but that is the identity of Ubers and the tier finds its beautiful balance within that, just like ADV Ubers did with the Lati twins and the Weather Duo or how DPP Ubers did with all its mighty Dragons or how BW Ubers did with it's seemingly overwhelming hazard game. Why do tournament players find those acceptable but not the currently blossoming metagame of USM Ubers? Finally, we get to the most juicy and perhaps the worst argument used by anyone who is not familiar with the Ubers community, the "oh you have troublesome and toxic users" argument. Absolutely every corner on Smogon is filled with drastically different individuals, and toxic behaviour is not exclusive to any tier, randoms to prominent names alike. It's undeniable that Ubers experiences those same issues, however there is no significant difference in those numbers when comparing Ubers to any other tier, especially when you look at other core metagames. Instead of trying to provide whatever circlejerked subjective behavioral evaluations you're trying to or trying to reiterate that awkward idea that Uber players are naturally toxic or that we should be excluded from future tournaments because a handful of people rubbed you the wrong way, you might as well close this thread because you're just trying to find whatever excuse is more acceptable to remove Ubers from whatever it is, for the nth time.
I argued for Ubers' inclusion during the SPL tier selection because it truly hurts the development of the tier if it's constantly being removed from tournaments where the highest standard of play should be present (which makes it harder to eventually bring it back up into it), and if we're going to have this song and dance every time tournaments come up, the tier will definitely be negatively impacted, because all this does is create a disconnect between the tournaments community and the Ubers tier. So before you go ahead and change the status quo based on nothing but a subjective and unbacked agenda that has been regurgitated by a disconnected and outside minority, please reconsider your main points and actually give us something noteworthy.