Sylvina-san. You read, but you fail to comprehend.
If someone no longer wants to improve, they have already quit.
I stroke my magnificent silky white goatee.
Hmm.
You don't pay my sub.
You, also, don't pay my sub. The simple fact of the matter is it's not worth doing a PF for a daily -- merely bring a friend along (which you should do anyway to queueboost a dps buddy) so you can fix any vote kicks, and you then have the authority to weed out whomever you wish for whatever reason you wish -- as long as it's covered by "playstyle differences."
I suppose you could go on a grand crusade where you kick anyone that is even moderately critical of the performance of the party, but pfft-- nobody's gonna do that. Let alone go along with a kooky desire to kick the players telling the icemage they can do better post-Stormblood. If anything at all came of it, you'd get booted for being a busybody by a votefixing duo.
The common thread between the two dungeons is terrible healers have an especially bad time, which is only compounded when other roles don't know their buttons. This is perfectly fine, as anyone able to even make it to either dungeon has had more than enough time to read their tooltips.
There's a minor excuse to be had with skips in the vault (though they should be kicked so they can read their tooltips), but even that flimsy justification just doesn't apply to the Burn.
Simply put, any healer that can't heal through the Burn needs to be sent back to Bardham's Mettle, Doma Castle, Ala Mhigo, and Castrum for remedial lessons. Other roles can pick up some things from those dungeons, as well, but the healer in particular has things to learn in each of those. This includes people that afk leveled through HOH or lower level roulettes; if you level something to 70 and didn't bother to learn anything as you went, or perhaps alt-geared it to get past the ilvl gate, I'll relish a vote in favor of kicking you if you don't perform the baseline in anything gated post-stormblood.
And incessant mollycoddling of players four patches into Stormblood that haven't learned even the basics they were expected to know before they even hit Praetorium have done an awful lot to make this particular brand of toxicity (as quoted) insufferable in the equal and opposite way. I don't expect the icemage to hit Savage-tier damage in the Burn, I expect -- and by fixed votekick, demand -- them to have a baseline degree of competence with their class.
They are free to play how they like by themselves in solo content, even icemage. Just not with players in post-Stormblood content. If players expect me to tolerate them in post-Stormblood content when they can't be bothered to even read their tooltips, I genuinely positively absolutely seriously beg them to uninstall. Because they quit a long time ago, ignored a hundred lessons along the way, have no fire to improve, and it's unhealthy for them to continue playing; not to mention unhealthy for the community as a whole to tolerate such indifference to three other peoples' time.
If they, instead, would ask me for any sort of guidance outside of said content I will bend over backwards, to my limited ability, to offer guidance. But if they show up in the Burn wholly unprepared, they need to hit the pavement.