SE made this game AST only, why?

[Rymm]

I thought AoE damage was getting nerfed across the board for most classes/abilities? I assumed it was because SE never liked those huge-pull, speed-run dungeons that a lot of players are so fond of. In HW they slowed us down with all those gates blocking us after two or three trash packs, now it seems like they are trying to gimp our ability to burn down big groups at once. If it's everyone getting nerfed, I don't see how it's the end of the world for SMN or SCH.

And I never used Sustain as SCH (never really played SMN, so I can't say how much they need it) but it wasn't even on my bars. One less button to worry about, so I'm pretty 'meh' toward that as well.