That has been the ff14 dungeon playstyle since the very beginning unless you as tank know you're undergeared and know you cannot handle the monsters (especially in mid level range).

But nowadays dungeons are so undertuned, there's literally no reason to not just go until the end and just nuke them all down at once. This is reinforced by the convenient fact that 1 w2w pull is about 60seconds (2min meta ring any bells?)

Now if trash mobs would be minipuzzles like criterion however, it would turn the whole boring dungeon treadmil upside down. Qarn was actually very ahead of it's time before getting stomped into oblivion difficulty wise