I have been trying to explain the "T-Shaped Person" for years! People keep asking how a creative person survives the boredom of spending years learning the arcane details of programming, networks and the internet. How can a creative soul survive typography, Ux, "limiting" creative briefs, client demands and media research.
If you want to be single-minded, go be an artist, or musician or a writer allon your own in a garret somewhere. Stay away from practical execution. If you want the world to respect what you do, you need to be "T-Shaped". YO need discipline, and you need to open your mind to other people and ideas.