The understanding with most art is that it takes several rounds of critique for a piece to even be complete, much less for an artist to reach their overall potential. And it's considered an honor to receive criticism from someone whose work you admire.
Similarly, self-management is completely necessary if you're completing something long-term, like a novel. Scrappiness, too -- it's very often the case that you have to skip around the gatekeepers to reach an audience for the first time.
I'd also add that there's a certain strange cognitive advantage. A lot of art is built on taking concepts from one situation and applying them somewhere foreign -- translating the feeling of loss into a series of musical notes, or applying the principles of the punk rock movement to dance.
I know it sounds like bullshit to a lot of hackers. But that trick, of abstracting away the details of problems so that their solutions can be used in isomorphic situations, is very handy in computer science.