My point, ret aoe with 4set and DP has no time limit due to cooldowns which most (if not all) classes have.
And yes, during progress it's a lot more strict about what you can allow yourself to do. Like the first week(s) of this tiers council fight, now that we're later on we pretty much stack up and aoefest it. But on fights with Tortos like adds, (bats spawning everywhere often and numerous enough) ret will shine because our aoe isn't (won't be) limited by say metamorphesis, combustion spreading, bladestorm and so on.