I just dont want to dump our limited MP on having to resummon is all. Figured they could just make it like Smn's Bahamut in that your summon goes away you get the usual aetherflow and buff then auto resummons once done. Another thing they can do is just have your faerie tether to yourself when you use dissipation making it unable to do anything, but you get the buff and aetherflow, your faerie is around so you still gain gauge, and wont need to resummon once done.