Quote Originally Posted by Krotoan View Post
I don't even need a list.. I just need to be able to mouseover something and get a tooltip that tells me whether I have it or not.
Agreed. It's insane that seven years in this still isn't a thing. As tooltip info goes, "have I leaned this" is a million times useful than "is there currently one in my inventory". That goes for anything learnable. Mounts, minions, rolls, bardings, TT cards, emotes, hairstyles, master books... the works.

For reference, here's what a WoW mount tooltip looks like. There are no questions about whether or not you already have it.