The elephant in the room here is the Auteur Theory [1]. Film is a uniquely collaborative art--a director needs to communicate his or her vision to a very large team with specialized technical skills. While tempting to do it all yourself, that doesn't scale. There's a direct corollary here with running a company.
The craft, skill, and genius of great auteurs and entrepreneurs is inspiring a team with his or her vision to build great things together, not in doing it all him or her self.