Is it Time for Active Mitigation?

[Absurdity]

I'd actually say that GNB is the only outlier with it's 30/60 seconds quick oGCD burst that needs some setup before execution.

PLD is "do your basic rotation (wether you have fight or flight changes nothing), press oGCDs and every 60 seconds you get to spam the same ability 5 times (or I guess in Shadowbringers it's 4 times and then another ability once)"
Warrior is "do your basic rotation, press oGCDs and every 90 seconds you get to spam the same button 5 times, also don't overcap on gauge"
DRK is "do your basic rotation, don't overcap on gauge or mp, press oGCDs and every 90 seconds you get to spam the same button 5 times, but with less impact than warrior"

Neither Delirium nor Inner Release require any setup, you just press the button when it's ready and I would argue that even PLD's MP cost is negligeable since you're always at full MP when Requiescat comes up as long as you do your basic rotation.

Technically all tanks in XIV already have active mitigation, you have to press an ability to mitigate damage for a set amount of time which requires you to know when high tank damage is going to happen. The active mitigation in WoW might as well be passive since damage is constantly high and you're trying to keep your mitigation rolling as much as possible, not all that different from earlier versions of the game where you just stacked defensive stats to have said mitigation at all times.