If you replace "must" with "can", then I agree. Taken as it's formulated, literally, I think it flies in the face of how much art comes into being. There's a lot of mucking about especially in the 'fuzzy front-end' of the artistic process, that constitutes a search for intentionality and direction. And the degree of control by artists of the process involved is really very variable. Some like to be in that position (and manage it), quite a few don't. Artists are a rather motley crew, it seems to me. They appear to defy generalizations. Perhaps, if anything, that's their most defining characteristic. That, and being overall utterly allergic to anyone saying the word 'must' in their vicinity. Tends to freak them out pretty badly, much of the time.