Oh wow, that's... some serious buffing. I definitely prefer the shorter, snappier Carnal Chill for one. For some reason I thought people were still talking about the last set of DRK PvP buffs; I missed this set completely. Agreed that the DA change component is purely QoL. It's nice that it'll no longer ever stick out past the 2nd GCD, even if that change isn't exactly significant either.
I'll just stand by my hopes for a significant Grit mana cost reduction and a slightly Dark Arts cost reduction. That and maybe some small buff to DD, DM, and SS (preferably in a way that eases access to otherwise MT-locked skills from OT position or from afar, perhaps with an ally-targetable support element).
Side-note though: That Aetherflow buff seems overkill, just like the SMN overall damage nerf before (as deserved as the burst nerf may have been when combined with their very nice general output). Would really rather it be reduced to 1 stack lost per hit, but One-Ilm Punch able to strip two debuffs on crit, making it a bit more useful on average, even if no longer THE arcanist hard-counter. If ammo is currently removable, then it should get the same treatment.
