While I agree with your underlying point, I think a few of the arguments you raise are questionable to say the least.
Additionally, while unexpected tera types can flip the direction of a game, the vast majority of the time you could have accounted for these by better preserving your checks to the given sweeper. There are no sweepers in gen 9 OU who can singlehandedly overcome all of their checks with just one tera type, and if this does happen to you then you could have either played better so that you had more resources in the actually game to check the threat or constructed a better team to more adequately face the metagame.
If you have real arguments please flesh them out more qualitatively, it’s fine to have issues with the uniform ban on action against tera, but you’re literally just spreading misinformation.
Tera Preview has been seriously considered but never brought into tiering action because of how revealing so much information before the game starts hampers the information gathering aspects of the game which are a vital form of skill expression in a given format. Tera Preview essentially promotes less skilled gameplay overall and was determined to not be an effective restriction because of that. Tera Type Limits are honestly just stupid and don't actually address any of the underlying issues of tera because it isn't just 1 tera type on each mon that's powerful, a lot of mons have a variety of tera types and restricting the types one can terastallize into does not change the offensive and defensive utility tera provides unless you were to do something completely assinine like banning all tera types except for bug. If there's an actually interesting way of implementing this that would contribute to the competitiveness of the metagame I'd be happy to hear it but as far as I understand it the idea sounds rediculous and hard to implement. Additionally you claim that there is no serious consideration for a Tera Blast ban when it was literally included on the last tiering survey and has active support from tiering council member Ausma among others. Your argument here addresses flawed solutions that shouldn't be implemented and a measure that was literally included in a tiering survey. The middle ground "solutions" have to actually do a better job of promoting a healthy and skillful metagame in order to be solutions in the first place. Additionally Tera itself has received no proper support for tiering action since the initial test. This point does not make sense nor does it actually critique any of the valid issues one might have with tera.“There was never enough support for a ban” → Yeah, because they never actually tested a middle-ground solution. The only suspect was a full ban vs. no ban, with no serious consideration for Tera Preview, Tera Type Limits, or Tera Blast bans. They ran one suspect early in the generation, saw that 60% of players didn’t vote to remove it, and just never revisited it properly.
This is completely disingenuous. Each mon does not have 18 different viable tera types. When you're playing a game you most often only have to account for 1-3 common tera types used on a given mon (at most, a mon will have maybe 4-6 different viable tera types in the meta at one point i.e. water/flying/fairy/ghost/fire/dark/fighting Gambit) A huge part of any metagame is tier knowledge, and a part of that knowledge in Gen 9 is knowing what tera types a mon could viably use and observing your opponent's team structure, revealed items and moves, play style, and the metagame's trends to assume what a given tera type could be. It's absurd to mention that each mon has 18 different tera types (19 actually with stellar) because not every mon is going to actually be a viable user of those tera types.When every Pokémon in the game has 18 different possible defensive/offensive pivots at all times, you’re not making a “bad read.” You’re being forced into a guessing game where no amount of skill can completely mitigate the risk.
That’s not competitive integrity. That’s just slot machine-tier gameplay.
Additionally, while unexpected tera types can flip the direction of a game, the vast majority of the time you could have accounted for these by better preserving your checks to the given sweeper. There are no sweepers in gen 9 OU who can singlehandedly overcome all of their checks with just one tera type, and if this does happen to you then you could have either played better so that you had more resources in the actually game to check the threat or constructed a better team to more adequately face the metagame.
If you have real arguments please flesh them out more qualitatively, it’s fine to have issues with the uniform ban on action against tera, but you’re literally just spreading misinformation.