The entire aetherflow system feels entirely vestigial on summoner right now. The fact it's not tied to the trance rotation at all makes it feel wholly disconnected, like it should've just been done away with and become solely a Scholar mechanic. Fester was never thematically very Summoner-y (being tied to the Poison mage identity that they've been gradually abandoning), and at this point it feels that, if Egi Assaults weren't so clunky, they should just completely replace Aetherflow as Fester as far as APM filler and potency goes.