I said it before and I’ll say it again.
I think banning Tera outright would be way to drastic of a move and I think that many people put too much blame on Tera for X strategy/Pokemon being over the edge. If Tera were banned, I’d still see tons of Pokemon still being Ubers anyways over the course of Gen 9. Like yeah, Annihilape is incredibly strong and making itself Water for a better defensive typing is definitely cool, but I feel like the Fighting/Ghost type (easy top 3 types) with a move that easily reaches BP surpassing Explosion without major drawbacks and is an extremely spammable type would still be Ubers for sure.
However, I do feel like Tera Blast itself could be looked at. Tera Blast is a move that’s very similar to Hidden Power. Hidden Power has multiple advantages like being able to be used on multiple Pokemon on a team, it not requiring a limited resource, and smaller things like getting Technician boost, being consistantly special (namely for Lando), or not always being telegraphed. Though you pretty much knew what Hidden Power a Pokemon used like 1-2 different types for Hidden Power. Tera Blast is similar in that regard too where you have a rough idea what your opponent is using. However, unlike Hidden Power, Tera Blast 99% of the time has an effective 120 BP thanks to Tera STAB (and 106.67 BP) compared to Hidden Power’s 60 nonSTAB BP. Hidden Power gives majority of Special Attackers any coverage they want with the drawback of it being weak. This makes sense as coverage is a massive make or break for Pokemon. As an example, Volcarona was extremely dangerous because it always had the option to chunk its checks with Hidden Power, namely Hidden Power Ground for Heatran. An HP Ground to SpD invested Heatran would still be around half.
252 SpA Volcarona Hidden Power Ground vs. 252 HP / 252+ SpD Heatran: 188-224 (48.7 - 58%) -- 50.8% chance to 2HKO after Leftovers recovery
With Tera Blast however, you can just straight up OHKO Heatran
252 SpA Tera Ground Volcarona Tera Blast vs. 252 HP / 252+ SpD Heatran: 372-444 (96.3 - 115%) -- 81.3% chance to OHKO
I did argue before that “well if Dragapult for Shadow Claw, would you ban Shadow Claw? or Ban Earthpower because Volcarona got Earthpower?” After some consideration, I realized that Tera Blast is effectively giving Dragapult Shadow Claw, or Volcarona Earthpower. Not only that, but also giving them Brick Break, Aura Sphere, Surf, Dazzling Gleam, Play Rough, Icicle Crash, Ice Beam, etc. all potentially in 1 move. They might have to choose between them, but fact is you still have something similar to Earthpower on Volcarona and every Pokemon has something similar to that coverage move they wished they had.
I’d say the best course of action is to discuss this and see if it’d be appropriate to do a suspect test later on. After the current radar is clean. It’s a good middle ground between Anti-Tera and Pro-Tera side as you’re not touching Tera itself and instead touching Super Hidden Power instead, something that can be compromised more easily.