First of all I have to give a shoutout to Estarossa. After this man railed on me for a solid 5 minutes for using the "unset" that is Scarf Infernape (right after I smoked him with it of course), he had a small change of heart. He's a sucker for Sand and he was just tired of all the Sunburns and Rain washing away his sandcastles. He loaded me up with some classified (and kinda gross) stall to get my reqs and end this weather war. I'm here to do my part.
Banter aside, I've played a variety of archetypes and tried my hand on some Sun and Rain teams myself. Since their inception I have become slightly less adamant about removing them from the tier. Useable and very creative answers to the weather have surfaced and I feel like playing Sun or Rain is no longer as free now people are more prepared for it. With stall Rain was rarely an issue, and with HO I could generally get around Sun (speed tiers being slightly but impactfully below the ones in Rain). I will however vote ban on both Drizzle and Drought for the following reasons:
-I feel like UU (pre-weather) was actually a very reasonably balanced tier. The best pokemon in the tier are excellent in their own right, but they definitely have well defined solid answers that don't strain teambuilding a lot. Enter Rain/Sun. You now have less than a dozen necessary pokemon to pick from and you need multiple to even play the game, let alone win it. Building a team of 6 pokemon that has a reasonable matchup spread against the whole tier is hard enough without the weather. So it's not that you need to account for many more factors, but they just can't be ignored because if you do you lose at team preview. Then when you're not facing weather, you're stuck with your AV Goodra and wonder why you even decided to queue up for a game in the first place.
-How strong these teams are without deviating from the main formula. Take a pokemon like Latias. One of it's defining factors in making it such a big threat is the amount of sets it can reliably run. Once you know it's set it's a lot easier to work around. With these weather teams, sets are borderline set in stone and they STILL are a menace to deal with. They also force more generic answers, as stated in the previous point.
-Most of all, even though this is a somewhat personal point, I just thought UU was a lot of fun the way it was. In OU every other game is decided by whether Ash-Gren Dark Pulse flinches you or not and you need 9 mons just to break down Toxapex. Now UU is all about dancing around your opponent (or vica versa) for 7 turns and hoping you have enough pieces left to play the game after. I feel like UU will grow into a very "matchup dependent" state, and I don't think that will be good for the tier. I feel like everything else has already been said on the subject.
It's a ban for me.
PS: Scarf Infernape actually outspeeds Modest Venusaur by 1 point and OHKO's both Venu and Houndoom reliably. Unviable probably, but even when weather leaves us, Scarf Ape is here to stay ;)