Tera is not uncompetitive. Even with that, Tera adds so much more flexibility to the builder and game that giving it up just doesn’t make sense for any reason than that you personally don’t like it.
There's a lot of reasons to kick it, and you can go peek at natdex where it's even dumber, but for the time being tera is here to stay (a small pool of mons makes it more tolerable for now) so I won't harp on this.
Even Annihilape only had Tera as one part of its equation: Rage Fist, Taunt, it’s typing, its bulk, and the fact that it decimated bulky teams with Bulk Up+Taunt not even needing Tera.
Ape could circumvent even offensive counterplay by terastilizing out of bad match ups, which was a pretty significant piece of what pushed it over the edge. It's typing pre tera was much more flawed defensively prior to tera, and made it possible to pressure it from getting out of control.
As far as the topic of shed tail being the problem which has somehow come back up again, I feel the need to reiterate that Orthworm's shed tail is far more high risk, high reward, due to how committal the use of it is. And due to the worm's low speed and spdef, it's easier to limit it with good play. Something like Espathra abuses it to be better than it already is, but it doesn't necessarily need it to become broken, as people have demonstrated.l.it can abuses its own substitute to get by would be answers. Other abusers are just that, abusers. But there isn't any other mon, except maybe Volcarona, who could abuse it a potential overbearing effect. And...
Average 700-800s player here but I'm honestly starting to feel like Shed Tail is still a stupidly broken move despite Orthworm being kinda of a bad mon, and it rising to OU is a clear sign of this. Not only does it feel almost as uncompetitive as Baton Pass, due to how easy it is to pivot around and keep momentum, but as we all know getting a free sub is pretty much an immediate win condition on certain mons (cough cough Espathra), if you don't have an answer or a check in the next turn. Combined with the unpredictability of defensive Teras, the opponent is very likely to get at least 2 turns to set up freely, and you'll end up losing a mon just to break the sub.
This turns otherwise manageable offensive sweepers like Volcarona, Dnite, Iron Valiant and Pult into nightmare fuel, often times completely turning the tides of the game.
I initially thought that Orthworm couldn't keep up with the pace of the meta, especially considering that it doesn't have Regen or recovery to allow it to spam Shed Tail, but now that people have started experimenting with Sitrus Berry and Rest+Talk this whole strat is getting quite annoying. I would like to hear other players opinions about it, cause I don't believe this move is competitive at all.
Edit: and I forgot, don't get me started on Shed Tail + Screens.
Can we stop comparing shed tail to baton pass? There is no comparison, beyond sub passing (which was never really a reason it got axed) and calling shed tail uncompetitive, when the sole broken abuser was made broken because of Regen+tail combo, while even having a golden premium collection of utility. People always used sitrus berry worm, which has never been an issue and something like a hypothetical rest talk shed tail is gimmicky and the definition of exploitable, as unlike rest talk Dondozo, Worm has very little relevant defensive utility when abusing shed tail.
Worm has proven to be functional, but calling it broken or uncompetitive when it's a much more flawed pokemon that requires a decent hand to get good mileage out of, just seems insane to me. Also no, worm rising to OU doesn't prove shed tail is broken move. It proves the move is worth making work on an otherwise meager pokemon and stretching the talents it does have to make it not dead weight.