I've finally come to the conclusion that all complaints about the class homogeny could be answered by making every class have to do its own silly minigame in terms of inputs, and any complaints about "balance" are ultimately moot because all of the sweaty WoWnigger parsefags have left a long time ago. Give DRK the ability to use its own HP for stronger and more frequent attacks, or even blood barriers it can apply instead of TBN. Give SCH the ability to weave every single fairy ability between every single non-fairy ability and make Aetherflow a long GCD that requires good timing to get back rather than just a shitty OGCD that gives you 3 pips with a tiny cooldown. Give SMN the ability to summon and actually have the summons remain persistent in the fight, being able to absorb blows or even help with things like towers or stack mechanics.

If every job is a whole mess and a half to play with, then every player's execution will be the balancing factor. Players who are godlike at their job can well-exceed the "expected" output that duties require for you to clear and get to blitz through content. Players who are middling at their job can still clear most content without serious adjustment. Players who are bad (like many, MANY players are now) can then be carried by those tryhard godmode poopsocks who want to excel as the #1 VPR or highest possible DPS output SAM when they need to genuinely work to get that far. If you have people who demand parses before they enter duties, just make it a reportable offense so the exclusionary parsefags get culled, and the highscore parsefags are allowed to still play as much as they want because all they want is to see their big number be bigger. Beyond that, no community is friendlier than the XIV community, so you'd easily be able to tell people to just be cool and not be faggots about it and they'd easily be able to accept it.