Level 100 Dungeons
I really like the increased difficulty of level 100 dungeons in general!
I also like that the healers have to use Esuna.
I also like that the tanks have to use Interject.

Higher difficulty in the dungeons, as well as the game "forcing" the player to learn to use their role's basic toolkit is long overdue, in my opinion!
In fact, I think there's still room to further increase the dungeons' difficulty level without even beginning to encroach upon the difficulty level of Extreme Trials.
Of course there should be, and already is, great distance between those 2 difficulty levels. And I think we can afford to increase the dungeons' difficulty even further, without compromising that distance.

As for the usual argument of old and/or disabled players being unable to continue the MSQ because of "great" difficulty, I'd be fully in favor of adding an option within Duty Support where, if a player dies to a boss, a button would appear that, when pressed, would resurrect them on the spot instantly and the boss would simply die instead, so they can continue as if they had won the encounter.

This button would only appear with Duty Support and only if the player has never cleared the dungeon before. It would not appear on any subsequent re-runs of the same dungeon, after already clearing it once, even with Duty Support.


In any case, I don't think that it's a valid argument to permanently hold back the possibility of dungeons being more engaging and more difficult for 99.9% of the players, because there's 0.1% of the playerbase who's disabled in some way that totally prevents them from clearing an Expert Roulette run.