One of the smartest people I’ve ever known, a Chinese student of Heidegger, once made a simple observation that’s stuck with me: the artist has to have plenty of ego in order to possess the motivation to create, but has to know how to set the ego completely aside in the process of creation itself. So being dispassionate is crucial to being an artist, but so’s being passionate. Not over-interpreting one’s work, keeping it open and trusting the audience is also critical, and perhaps you’re right: it’s the sort of thing that’s hard to do if we can’t maintain an objective or critical eye toward our work.