
/

Poison Heal - Gliscor would be ok as a physical wall, but with Wake running around it could struggle to stay alive. Breloom might find some niche but it probably won't.
A mon losing to

doesn't make it struggle to stay alive. Other mons like

lose to

, so what? In fact,

can scout

's choicelocked move with tect while healing a decent portion of HP. Even in the buffed up AAA tier,

can choose a few out of setting hazards, spamming knock (knock+taunt=progress), poisoning opponents, pivoting, PP stalling, scouting, etc.

/

Speed Boost - Gonna disagree with UT on this one, it should remain banned. I foresee Blaziken being too much to handle being that it could run a physical set, a mixed set, or a special set. On the special side its lacking in coverage and a boosting move, but on the physical side it has SD and tons of coverage. I could even see the mixed set viably run 252 Atk and 252 SpA, which worries me. Espathra is likely not an issue to the the prevalence of good regenvesters and the fact that Scarf R-Moon outspeeds even at +1
I think you have it the wrong way.

would be unable to keep up, being threatened by many mons and unable to break through immunities. Meanwhile,

can completely blast through water regenvesters (

) and

is not at all a counter with dazzling gleam existing.
More general here, I agree with most of UT's opinions here. Most of these guys would not be meta relevant or only have small niches, for example Azumarill might find a niche as a R-Moon check, but might need people to be running less anti-Water because of Wake. I also think that some unburden mons could be great cleaners, but not broken in any way. However, this leads into one of the issues of a native user clause for AAA - Trace/Skill Swap. If you can get Huge/Pure Power or Speed Boost/Unburden on some big physical attacker like Iron Hands its over for the opponent. Many of these native users might be unviable due to threats like this. It would be a niche counterplay, but worth noting.

is not a

check, it takes massive damage despite the resist and has no real recovery. Unburden mons would be outclassed by current physical breakers such as

,

, etc. and unable to do much to fluffy

. Trace/skill swap are irrelevant. The opportunity cost of running trace on a mon just to absorb a strong ability is massive. Wasting a turn and move slot with skill swap is even worse. The existence of trace would not at all make a restricted ability mon immediately unviable.

Magnet Pull - Zone would force most defensive steel types e.g. Corv to run volt absorb, but I think that if Corv has help as a defender physically it shouldn't a big issue. Many of the popular steel types have an otherwise good matchup into Zone and wouldnt be very effected. However I think it might only be viable as long as manaphy is the prime special wall. If Goodra-H or Swampert were to take over that role Zone's opportunity cost would become too great for it to overcome.

Good as Gold - Gholdengo is always one of the biggest mysteries in team preview for me because it can run so many abilities with decent viability, and I don't think this changes much. With scrappy Tusk being quite viable there isn't too much to say. Corv never wants to stay in against Gholdengo and Tusk can still remove anyway. Could be kinda annoying, but would have counterplay and probably wouldnt even be the best ability for Gholdengo.

Neutralizing Gas - I think that UT overstates its significance. I think that it can beat regenerator (the best ability in the tier), but manaphy only needs 20 speed EVs (with neutral nature and 31 IVs) to always outspeed 252+ Speed Weezing. However the bigger issue is Weezing's lack of bulk and good recovery it most certainly will be susceptible to being worn down or just KO'd outright by a strong EQ. It even can be easily outpredicted with a clean double into any hard hitting mon.
I disagree with all of these.
For

, "Forcing most defensive steel types to run volt absorb" is a massive deal.

is always around the top usage spot and for a good reason, it is incredibly important in many teams due to its ability to stop the absurdly strong physical attackers of the tier.
" However I think it might only be viable as long as manaphy is the prime special wall. If Goodra-H or Swampert were to take over that role Zone's opportunity cost would become too great for it to overcome." Wait what? Firstly,

would still be viable even if

didn't exist due to

. Secondly, mons don't just magically take over roles, so what you're saying is that it would remove regenvest mana from the meta. Finally,

doesn't even have a clean matchup into

due to IDBP or just unboosted BP, trapping and removing the hoodra.
For

, scrappy

is not an argument for it. You shouldn't be forced to run a specific mon with a specific ability just to remove hazards. Corv never wants to stay in against ghold? The whole point is that you switch ghold into a defog to block it. "Would have counterplay?" Well, yeah, the only counterplay is scrappy

which you shouldn't be forced to run. The only other things that can remove the hazards are even more niche scrappy spinners or a moldy defogger, which, well, would be dumb for obvious reasons.
For

, you are definitely unaware of the sheer impact that blocking regen has.

running speed EVs doesn't make it that much less tanky, but it naturally wants to run minimum speed to get slow pivots. You would also need to put a negative nature into something other than speed, and it uses both phys/spec attacks and doesn't want its defenses lowered.

has respectable physical bulk, a decent typing, and access to will-o-wisp and pain split to heal on physical attackers. Since there isn't a special fluffy (and no ice scales rn), teams often lean on a regenvester to absorb special hits in general. Having immunity abilities only would lead to wide-open weaknesses in the builder, and regenvests would be absolutely crippled by neutgas.
Anyway, my general thoughts are that adding restricteds shouldn't involve worrying about balance, because anything absurd can be banned. If it's worth it to make AAA more like other OMs, then I would say it's a good idea.