To play devil's advocate, what spells are missing (outside of healing obviously >.>) that you feel stood out from DAO? I know the Entropy tree was probably the most unique one that vanished now but Necromancer and Rift Mage both incorporate some of that flavor in their abilities.
I think the magic tree may have been stripped a bit, but I find myself with PLENTY of control and damage when I need it, in addition to having the ability to provide support via barriers. If anything, I almost feel like there's TOO much CC available for mages - not a complaint mind you, but between fire/ice walls, static cage, veilstrike, horror, conflag, etc there's no shortage of ways to stop an enemy in their tracks and combo/burst them down on your own if you wish.
Hell static cage/pull of the abyss are so patently strong it's rare anything ever gets even remotely close to my mage and that's counting stealthed rogues given you can predict their movement and see that shimmer to predict.
So for the sake of discussion, WHAT exactly are we missing from DAO that isn't replicated in DAI or that wasn't largely a different named spell that accomplished the same overall effect?