I like that idea for FGS to become Arcane Greatsword, make it's skills change based on your attunement, but make their cooldowns universal, so if you use Air X, it puts earth, fire, and water X all on cooldown, but that might be a bit much work for ANet to put into fixing the conjures. I'm all for Conjures being kits though. And it's a really simple change for ANet to make since the tech is there and exists w/ the engi kits. Minimal work for something to have a higher QoL.