Limited in the sense that his most recent work is VERY limited and is a rehash of boring riffs and I am not optimistic of an Alicia Keys future collaboration. Surely you don't consider Electronic or the Cribs groundbreaking. Modest Mouse was a better band without him and The Killers are about as limited and average as you can possibly get. I don't even hear him playing guitar anymore. His music is just a wash mixed in with his dreadful singing, forgettable lyrics, boring synths, and songs that go absolutely nowhere. Does he even still play guitar?