I do not think weather on a whole is banworthy or broken. Beartic is a good cleaner but faces similar problems that it faces with in standard in that it would rely on Hail which isn't a top tier playstyle by any means, and realistically doesnt overwhelm balance.
Sun though, I can understand. Traditionally the way to go about tackling Sun is to pack checks like Flareon, but after the HP nerf it has seen better days, while sun in general has increased in popularity. A means to tackle Sun could come in the form of introducing a Heat Rock ban, which gives teams more counterplay without permanently ashing the viability of mons like Ninetales or Torkoal in the same vein as a Drought ban.
Regarding Ursaring, it has been the face of anti stall for a long time, but I never found it to be outright broken, thanks to fat teams that it normally walks over losing steam to offensive playstyles which Ursaring struggles against. That being said, the situation will be monitered and if more people come out and can bring some more substantial evidence to Ursaring's broken attributes, expect results.
Ok ill start out by saying ive pretty much not touched TS since gen 6, mostly cos I haven't been a fan of the fact that it was made to be basically Extreme Tier shift (an Ubers based omotm) boosts wise because the leader at the time was worried that it might not get enough "hype" thus making it in my opinion, fairly uncompetitive. I think omotm's by nature fit the broken stuff for "hype" model, because they aren't made to be balancable enough to be competitively viable, as much as they are meant to be cool with lots of broken shit that attracts ppl in the month that they are accessible on the main server. TS never was intended to be an omotm so therefore shouldn't have catered to this crowd anyways imho, the point of the meta was to make the non-ou mons just as viable, not to make them Ubers level. Like ets was at least an Ubers meta game, which this isnt, so now its like ur the biggest idiot on the planet if ur using OU or UU mons, cos all the PU and NU mons have bst's of like 650+. I hope TS learns from this and next gen decides on more sensible boosts, cos I (and pretty much all the other oms players I talk to) much much preferred the old gen 6 boosts, and furthermore if that had carried over id actually be confident that TS woulda been up there with the other perms this gen and a staple in the big tours.
But regardless of my personal disagreement with the changes made to TS this gen, we are in a position where TS is one of the metas in OMWC, one of the biggest om tours of the year played by most of the best om players, and at the moment TS is a looooooong way away from hitting the balance levels of the other 5 oms in the tour. I personally dont think its actually possible to balance TS with the current boosts, but it can be improved from the state it is in right now. I know for a fact that im not qualified to speak extensively on this meta, cos I simply have 0 experience playing it pretty much, aside from a couple tours room tours where I won by spamming sun and oricorio. However, I am a pretty competent competitive oms player, and have generally been able to build, play, and theorise in other oms that aren't the ones I main to a still pretty decent level, and therefore decided to try and build a bit for TS and camo before this omwc started..... and ran into some roadblocks pretty damn quickly.
My biggest issue: Ursaring
I think in any balanced or even somewhat balanced meta, stall and balance should be viable. Therefore the proof that TS is nowhere close to that, is that stall literally is impossible to build. Whilst im not overly experienced in the meta, I do pride myself in being now quite decent at building stall in most oms, and I find it quite fun to try and construct a stall team from scratch. I did not have fun trying to build TS stall. I literally spent ages with my team trying to come up with a reliable ursaring check on stall and we were unsuccessful. This bitch is genuinely impossible to check defensively. Any non-resist is clean 2kho'd by facade, and its not even close. Like avalugg, a mon which after the ts boosts has 95/224 physical defences, gets obliterated:
252+ Atk Guts Ursaring Facade (140 BP) vs. 252 HP / 252+ Def Avalugg: 181-214 (45.9 - 54.3%) -- 53.1% chance to 2HKO, 252+ Atk Guts Ursaring Close Combat vs. 252 HP / 252+ Def Avalugg: 208-246 (52.7 - 62.4%) -- guaranteed 2HKO, and thats the fattest non-resist I could actually find. Not to mention if rocks are up, ur just straight up royally fucked. This means ur only real defensive counterplay options are: rock/steel/ghost. And you cant run rock+steel dual types cos then cc is sending you to the nearest parallel universe. Normally in an ou meta game where ur looking for a normal resist that can cope with fighting moves too, ur looking at skarm. Well if that was you, think again cos ursaring says fuck you to skarm:
252+ Atk Guts Ursaring Facade (140 BP) vs. 252 HP / 252+ Def Skarmory: 131-154 (39.2 - 46.1%) -- guaranteed 3HKO,252+ Atk Guts Ursaring Close Combat vs. 252 HP / 252+ Def Skarmory: 150-177 (44.9 - 52.9%) -- guaranteed 2HKO after Stealth Rock, with the ability to sd too. Like the only skarm set that stands a chance is counter, so you roost off the damage, and you counter kill it even if it sd's cos of sturdy.... but again this is fairly risky, and leaves ur skarm at 7% best case scenario and it also just makes ur skarm ridiculously passive.... and odds are ur opponent in omwc isnt an idiot, so therefore he plays it slow and gets rocks up.... cos close combat is a guaranteed 2kho after rocks. All the other rock or steel types do even worse, cos they dont even have reliable recovery like skarm. Like fucking mega aggron with filter doesn't come close to evading the cc 2kho.
So ok, ur tired of seeing facade and close combat murder your team.... so you do the sensible thing and go for a ghost type...... oh wait ursaring also gets crunch and play rough as coverage options. Here are the calcs vs the bulkiest ghost types in the meta:
252+ Atk Guts Ursaring Crunch vs. 252 HP / 252+ Def Doublade: 190-224 (59 - 69.5%) -- guaranteed 2HKO after Stealth Rock, 252+ Atk Guts Ursaring Crunch vs. 252 HP / 252+ Def Cofagrigus: 178-210 (55.6 - 65.6%) -- guaranteed 2HKO after Stealth Rock, 252+ Atk Guts Ursaring Play Rough vs. 248 HP / 252+ Def Spiritomb: 214-254 (70.6 - 83.8%) -- guaranteed 2HKO after Stealth Rock. . Fun right?
And the worst part is, this is just all in the effort of finding a mon that evades the 2kho from ONE mon, not even dealing with the rest of the issue which is killing said mon. Like because of the boosts, as Jrdn said, ursaring gets 90/115/115 defences, making it actually really annoying to kill..... and if ur building stall u cant really afford to whittle it down, cos this bitch gets swords dance, and if that goes up for free its literally a wrap. Like for example, in my head the first thing that came to mind was a ghost type with foul play.... it doesn't work:
0 Atk Dusknoir Foul Play vs. 252 HP / 0 Def Ursaring: 124-146 (32.2 - 38%) -- guaranteed 3HKO after burn damage, 0 Atk Spiritomb Foul Play vs. 252 HP / 0 Def Ursaring: 186-219 (48.4 - 57%) -- guaranteed 2HKO after burn damage, I wasnt able to find a single way to reliably even hard ct this one mon on stall, and thats honestly insane. Like I was delving into colbur shenanigans and counter skarm in desperation, even looking at msab + shed, just to try and make my stall remotely viable and thats super sucky. Like ive come to the conclusion that the only way to deal with this mon without delving into ridiculously niche ct's that are useless in every other matchup, is to basically sack and revenge.... which doesn't work on stall.
So overall, ursaring might not be the best mon in the meta, but its certainly up there with the most limiting mons team building wise imo, and any single mon which can cause this much of an issue should be banned imho. I was gonna mention a couple other things but honestly jrdn made all those points better, and hes actually played the meta more than me too, so I won't embarrass myself any more than I already have talking about a meta which I have 0 experience in. Was just tryna contribute positively to this meta before omwc, cos id rather not see a bunch of complaining about how a week came down to TS which is too unbalanced and uncompetitive. We have more than enough complaining in oms as is.