this is true, i think the hazard meta is centralized around a handful of mons and i don't think that's healthy, but i'm still skeptical of some people's proposed actions against it. specifically, banning gholdengo won't change jack diddly shit except for centralizing the meta around corv instead. i do agree now, though, that gliscor and hamurott both should be suspected, and i think banning those two would cut down on things a lot—that's where we were pre-home in terms of hazards, and they felt a lot less overbearing there. banning ting-lu is a fucking joke though, that's never happening and frankly doesn't need to happen
Yea, as many people say, Pokèmon teambuilding is mostly about the team synergy, and compared to the NPCs, we would switch our mon if we are in a type disadvantage or a not favourable matchup, and being able to block the switches, is so big that is why we got Shadow Tag and Arena Trap usually banned. Hazards instead, even if still allow the switches, it can chip them, poison or even slow the enemies, and in a hyper-offensive meta this is it's incredibly powerful, even more that we got Pokémon as Hamurrot which can both attacking, so ignoring Taunt, and even setting Spikes, which since it's the effect of the move, can't be countered by Magic Bounce, and all of this with also Sharpness which allows to do great chip and maybe even finishing some Pokémon with Aqua Jet.
But at the same time isn't so easy to resolve; you wouldn't ban the entirety of the hazards, which are required to progress the game and also beat some teams as Stall (even if some teams run 6 HDB and this meta exist but anyway) as sounding incredibly dumb, but also banning some mons is complicated, as banning Ghold would probably make some mons return, with also the meta incredibly changing, and as you said, Corv will just be dominant with also its typing, while Ting-Lu even if can make progress with Ruination, most of the time is passive as most of the common sets include Spikes + Whirlwind to chip the damage and also remove possible boosts, and it's currently one of the few defensive mons that is in a good position in the offensive meta. Gliscor and Hamurott would be the only ones that make sense to test, as one is currently on the radar while the other got many voices of negativity on it.
Suspectingin the future them would be a great start to see if them removed could slightly help the meta to get healthy, even if in the current state it is now is probably impossible