Observations on DPS in End Game

[Alkimi]

in MOST dungeons and endgame content, if a dps is doing 70-80% of their potential damage the enemies will still die.

Now, maybe, but only because they all overgear the content. If they go into 2.2 on Leviathan Ex or Turn 6 with their i90 gear (probably equivalent to doing current coil in darklight) only doing 70% of their damage then they're simply not going to clear it.