I haven't been too active recently in this tier, but I do have 3 opinions, one of which I don't think is too odd.
Unban Drought + Chlorophyll, maybe ban Venusaur: From what I've understood with this tier's history is that Drought + Chlorophyll got a clause due to Venusaur being overwhelming and swept teams immediately, thanks to Sleep Powder, Growth and boosted fire coverage. But not only was this complex ban not necessary over just banning Venusaur, it also went against Smogon's standard tiering and banning philosophy. Since the Drought + Chlorophyll ban, many things have changed, which includes sleep moves, and Arena Trap, something that allowed Chlorophyll Sun teams to easily get rid of Tyranitar and Heatran. With that alone, Sand teams have very consistent counters to Chlorophyll teams now, without getting instantly punished for it. And if Venusaur does end up still too broken and unhealthy for the tier, ban it, not the complex ban for Chlorophyll, because the other Chlorophyll pokemon, like Victreebell and Sawsbuck, were also good, but suffered from lack of viability because they weren't allowed to use their abilities when that ban was for the majority from one other pokemon's unhealthy success. They themselves were not the problem. And the banning of sleep moves and Arena Trap also apply to them, so they are still worse off compared to pre-Chlorophyll ban. Personally, to me, current Sun teams feel like archetypes trying to limit both Sand teams and Rain teams at the same time, and are otherwise... well, viable, but not as much as Sand and Rain teams.
Unban Cloyster or ban Volcarona: So, I never thought Cloyster was too broken, I think it's just as hit-or-miss of a sweeper as Volcarona is, either they get KO'd trying to set up, or they sweep entire teams. I do understand why Cloyster got banned, once it gets a Shell Smash off, it's difficult to stop without a priority move. But if Cloyster got banned, I think Volcarona should also follow. If Volcarona stays, I think Cloyster needs to be unbanned. I understand that that's not how tiering and banning works but that's how I see it.
Ban Jirachi/Serene Grace + Flinching moves: I am an avid Jirachi hater in competitive and have openly complained about it for years, so I'm not expecting too much from this one. I think boosting the chance to flinch with damaging moves is simply much worse than Evasion moves, it's not fun to deal with and it's unhealthy for any meta, no matter how one spins it. It takes much less time to set up a paralysis, and one can also go for it turn 1 without risking all that much. The opponent is always at a disadvantage if the Serene Grace Pokemon gets paralysis off. When facing Evasion boosting, you can at least use healing, boosting, or field effects. With flinching you can't even use that. Of course I understand, Jirachi, and other Serene Grace abusers, have counterplay. But that doesn't remove the RNG factor. One still needs to get lucky to fire off the move they want to use against the Serene Grace abuser, and I'm assuming that is the same reason why Evasion moves and abilities were banned.