Oh my god finally this is up, anyways, I now have motivation to give my thoughts here, and anyone is free to change my mind.
Tera as a mechanic was interesting for like the first two minutes of the meta, and I had genuine hope that it could be an interesting twist on how we build and play, albeit I was still slightly cautious on it since type change is a lol. Then I found out it gives you Adapt if you Tera to your STABs, and played a few games with some Fun Pokemon. This mechanic is horrible competitively, and just gets worse and worse as time goes on, the fact that matchups can be switched by an unpredictable (timing wise, for clarification, not type wise. just stating this now because every mon runs the same 1-3 tera types, very rarely are people differentiating, so actually guessing the type IS NOT THE ISSUE. And adding a Tera types on preview restriction is barely changing anything for 90% of players who have played more than 5 games of national dex.) Ok sorry for that little rant, but yeah, the fact that I have to guess wether I have to click cc or Zen Headbutt with my MMedicham on the Kingambit (If its Tera fight), or if i even should have gone to my mega medicham (if its Tera Dark), is extremely unhealthy and does not reward good play, and rather punishes it even further. Positioning and sacks are an extremely vital part of pokemoning, and doing that well and then having it thrown back in your face when the Tapu Lele Teras fairy and you cant revenge kill it with your dragapult anymore, or the Gastrodon that you painstakingly wore down with hazards into range of your Barraskewda CC clicks Tera Ghost and your progress made via the well timed doubles and predictions go down the drain. This is one of the more notable grievances I have with Tera, as it can (and often) takes away the reward of good positioning and a good gameplan. While I do agree that utilising this defensively is an amazing healthy boon for defensive teams that allow them more creative liberty building wise, I do think that this large restriction creativity wise is due largely to Tera, as hard checks to things are either less required / things are easier to develop counterplay to, Ie pex wont need physdef to deal with rain, so it can afford spdef to take stuff like rotoms volt switches better, meaning tera dragon isnt needed anymore. Also, to clarify, i dont think any mons are fully enabled by Tera, and will still be solid / good post tera, yes, this includes Skeledirge, Garganacl, and Dnite, the formers defensive type, while much poorer than pure water/fairy, is still very flexible, especially now that it isnt forced into Tera water Physdef to deal with rain, ie SpD to deal with Valiant, Volc, Char Y, Serp, or keep teraphysdef to still deal with Ace, Zama, Medi etc etc. People acting like this mon is going to drop off the face of the earth post twra ban is insane, this mon is still solid. Not to mention experimentation with more offensive sets like OU has is still very possible. Garg on the other hand turns from a borderline / if not broken mon and super mu fish into a healthy utility option on bulkier teams, with wincon potential with good support, salt cure is a broken move, and its ghost resist + rocks + setup all make it a solid mon even without tera. You really only need to Tera it if u load vs a Zapdos’less rain team and want to 6-0 with Tera water, or u fight something like Tera Dragon Pult which blasts through everything u have, so u Tera fairy, or if their sole garg cplay is some electric like Koko. This mon is unhealthy with tera, but still great without, please do not underestimate it.
OK sorry for dragging on so long, now to talk about STAB tera, because OH MY GOD i hate this shit. Rain is one thing, forced to tera water stuff like skeledirge BECAUSE MY PHYSDEF PEX does not take the water moves is CRAZY, imagine if pex actually checked the waters lol. Shit like dragapult having calcs like this:
252 SpA Choice Specs Tera Dragon Dragapult Draco Meteor over 2 turns vs. 112 HP / 0 SpD Kingambit: 305-359 (82.6 - 97.2%) -- 25% chance to 2HKO after Stealth Rock
HELLO THIS IS A RESISTED HIT ON A KINGAMBIT, WHY IS IT NOW A 5050, I WANT TO ACTUALLY TRAP DRAGAPULT ??!
252 SpA Choice Specs Tera Dragon Dragapult Draco Meteor over 2 turns vs. 164 HP / 0 SpD Tyranitar-Mega in Sand: 306-362 (80.1 - 94.7%) -- 43.8% chance to 2HKO after Stealth Rock
HELLO THIS IS A MEGA TYRANITAR IN SAND, WHY DOES THIS NOT LOSE TO DRAGAPULT??!
252 SpA Choice Specs Tera Dragon Dragapult Draco Meteor vs. 252 HP / 252+ SpD Vessel of Ruin Ting-Lu: 222-262 (43.1 - 50.9%) -- 3.9% chance to 2HKO after Stealth Rock and Leftovers recovery
WHY IS MY TING LU TAKING 50 FROM A NON SUPER EFFECTIVE STAB MOVE ??!
252 SpA Choice Specs Tera Dragon Dragapult Draco Meteor vs. 252 HP / 0 SpD Assault Vest Tornadus-Therian: 258-304 (71.2 - 83.9%) -- 68.8% chance to OHKO after Stealth Rock
WHY IS THE AV TORN KOED BY A NON SUPER EFFECTIVE SPECIAL ATTACK AFTER ROCKS ??? To put it in comparison how fat AV Torn usually is regarding special moves:
252+ SpA Choice Specs Tapu Lele Psychic vs. 252 HP / 0 SpD Assault Vest Tornadus-Therian in Psychic Terrain: 229-271 (63.2 - 74.8%) -- guaranteed 2HKO after Stealth Rock
Even Specs MODEST lele does not ko with stab psychic in terrain after rocks, and this is one of the hardest hitting things on the special side in the tier without tera lol.
And thats just Tera Dragon, a bit underrated of a Tera type on it imo but it is insane. Tera Ghost is just as bad, makes Shadow Ball 20x more spammable, and basically denies any soft checks / prevents trading with frailer mons.
Another fun one, Zamazenta!
252 Atk Choice Band Tera Fighting Zamazenta Close Combat vs. 252 HP / 4 Def Tornadus-Therian: 221-261 (61 - 72%) -- guaranteed 2HKO
Lets do 70 to a resist amirite!
252 Atk Choice Band Tera Fighting Zamazenta Close Combat vs. 0 HP / 0 Def Tapu Lele: 117-138 (41.6 - 49.1%) -- 84.4% chance to 2HKO after Stealth Rock
What if u said u wanted to use Lele as a soft Zama check (since it has a 4x resist….) ? Zamn, cant even switch in once unless ur scarf!
252 Atk Choice Band Tera Fighting Zamazenta Close Combat vs. 248 HP / 220 Def Zapdos: 168-198 (43.8 - 51.6%) -- 10.9% chance to 2HKO
Bulkier flying? Nope.
252 Atk Choice Band Tera Fighting Zamazenta Close Combat vs. 252 HP / 0 Def Toxapex: 129-152 (42.4 - 50%) -- 91.8% chance to 2HKO after Stealth Rock
Pex is bulky and resists water, surely this can recover on it, knock off the band, threaten scald or tox burns right? nope, popped, forced again to run physdef to even hope to scout this mon lol.
All of these would be decent checks / pivots at the very least without Tera, and make these mons 20x less brainless since they have to actually think about positioning themselves with uturn, have to think of clicking coverage moves instead of just stabs most of the time to force progress, while also making them much more forgiving in the builder. Contrary to what people think, realistically Tera is actually a hinderance creatively, a lot of the creative tera types are all mostly due to Tera forcing it to happen, rather than a genuinely healthy interaction. A small mention since it really isnt that important but tera blast still causes issues with some mons, ie teapot, but is not even close to a main reason on why tera is dumb, just another small one, just to clarify since some people still think this is a major issue lol?
A bit short on this section but a ton of stuff are dumb that are bannable / banned / are looked at because of tera, are fine and healthy / still good without it, ie rain dnite gambit espathra moon melm shed volc ghold ape pult and maybe even zama lol, i cant think of even 3 mons that become actually bad if tera is gone (that wasnt already below average), nothing is that reliant on tera to function. just adding this part in because i have seen arguments that tera makes a lot of mons viable, news flash: it doesnt! it just makes a lot of mons broken.
tldr tera does not reward good positioning and play, makes a lot of healthy / good mons broken, barely offers much healthy aspects, a lot of perceived “healthy” aspects are mostly just offensive tera forcing u to take measures u normally wouldnt need and tricks u into thinking it is healthy creativity when u use tera to remedy it, its not as black and white as people think. tera also gives us a lot of new mons, some of which r very healthy for the meta, and means normally healthy mons which might be banned with tera stay in the tier
tldr tldr: ban tera lol if u want a funner, healthier, and overall better meta!