I'm an artist myself and I still think it applies. If I take a client they are going to want it done in a reasonable time frame. At some point I will have to make the call of "Good enough to ship."

But even when it comes to personal projects it's useless to work on the same project forever. Often that stunts growth (new pieces teach you new things) and it also makes you a lot less prolific. I've met so many artists who let the fear of not being perfect stop them from drawing much at all. They fidget over the same drawing for months and even when they finally finish it's because they give up, hate what they made and are sick of looking at it. Something they might have been passionate about is now a source of sadness and frustration to the point they don't want to do it anymore. There is no such thing as perfect. Even the best masterpieces in history had to be declared "finished" at some point.