People are against it because it is for that individual group to decide whether they want to continue on with that weak link, and as is the case with all things you really ought to delve into encounters. You're juggling both the difficulty of an encounter and the requirement of pushing a sufficient amount of DPS. They are only going to get better by doing such. In the particular case of this Miqo'te it is for the team they cleared with to judge them and pass criticisms. If their feedback is being shutdown cuz parse then that's incredibly conceited, especially if they're only trying to offer valid feedback or criticism, and especially in the event that the other group hasn't even progressed that far. If someone sacrifices some DPS to ensure they're able to do all the mechanics adequately enough then that's a perfectly valid solution with merit. - It's just as bad when someone gets overly full of themselves and either greeds and causes a wipe, or outright fails a mechanic. People shouldn't be using a singular clear as the sole indicative measure of player skill or willingness to learn, but rather observe a trend wherein the player still fails to improve over the course of several kills.
It is precisely because of people like they were playing with as to why people are pushing against the idea of it - "Well ur feedback is invalid cuz you have a grey parse" - All feedback and opinions should be treated equally and objectively. Not by someone who is overly vein.
I think there's a prevalent problem in this community in that the way they present the criticism or pointing out of mistakes is.. Questionable, as exhibited by the sheer fact that people are under some false illusion that presenting a criticism will result in a ban. Something actually mentioned barely a couple pages ago on this very thread.
Oh and before someone gleefully comes out with the "Do u even raid bro" - I'm just going to counter that beforehand by saying irrelevant when many of these mentalities permeate into the more casual content, in addition to the simple fact that many of these mentalities are not just exclusive to FFXIV but apply to practically any multiplayer game. So don't bother coming with that.