what is it about Calm Mind / Quiver Dance / Dragon Dance that you cower in fear over? As someone who is possibly going to vote ban on Frosmoth in PU, from my point of view, you need a very specific combination of traits, and for everything to go well, in order to get the conditions for a clean sweep against any decent opponent, even with so-called "broken" pokemon.
Notice how most of the setup sweepers that signify this boo-hoo-hoo are brutally weak to knock off. Stop scaring people with the television!
Set up sweepers should have reasonable outs against them so they can’t just snowball and roll over teams. All the set up threats that have been banned from OU this gen have have that absurd snowball/sweep capability, and they also have had minimal counterplay. In fact let’s go through them.

taunt+bu sets were unreasonably hard to handle as it punished defensive teams which couldn’t damage it significantly due to Rage Fist while Drain Punch healed off damage. RestChesto and Leftover variants were both nasty and Tera only compounded the issue and often took multiple Pokémon to bring it down.

way too strong and difficult to answer after it boosted which it did with ease. Much like Ape it often needed multiple Pokémon to bring it down if it didn’t outright sweep. Tera exacerbated it but tbh it was broken with or without it.

Way too fast which made handling a boosted Pao very strenuous, especially considering its priority.

pretty obvious but incredibly brainless snowball Mon that overwhelmed teams with little effort and had far too specific of counterplay.

same as bird but had ridiculous versatility in how it could set up and sweep making prep for it near impossible to do relia

easily set up due to excellent stats and was way too hard to remove once boosted.

incredibly threatening and hard to remove once boosted, easily left tons of damage strewn about even if it didn’t sweep which enabled its teammates (this is relevant and I’ll get to it).

basically impossible to revenge KO without priority after it boosted and unburdened and very strong with very limited counterplay.

extremely strong, and difficult to remove once boosted (seeing a pattern?) which often forces multiple trades to remove it, if it didn’t sweep outright. Extremely centralizing when it was legal.

outrageous and versatile with capabilities of snowballing super quickly and was very difficult to prep for.
All sorts of broken set up threats are broken whether it’s through speed and power once boosted that makes them capable of just cleaving through teams without specific counterplay, or they’re the slow burn super bulky type with great longevity that once boosted are very hard to remove and can claim many KOs before being removed, if they are at all. And again have specific counterplay.
The point is once these threats are boosted they very often threaten to end games or at least claim multiple kos, and easily at that, unless they face the specific counterplay they had. It makes for restrictive gameplay when they’re around and unbalanced, generally less pleasant and less enjoyable metas.
Also all these I listed save espathra are not weak to knock off, and the move does nothing to halt their sweeps.
I never even said it should actually be unbanned, just that its not really broken
It is very much broken and for the same reasons as all the other pasted banned set up threats pushed to the extreme (super fat, access to Tera, incredibly hard to remove once boosted, and it’d just prop up those types of teams more than ever (and screens are strong atm but calling them the best playstyle is a hot take for sure). Like what is your strategy for beating just a simple CM+Wisp+STABS set factoring the many tera choices on top of everything?