This reminds me of the pottery class parable from Art & Fear. At the beginning of a pottery class the teacher divides the class into two groups. One group is to be graded purely on the quantity of pots they create, the other group solely on the quality (or, make one perfect pot). At the end of the class the group that focused on quantity had produced better results.

Somewhat counterintuitively those that riff and just try a lot of different things get better over time - exactly what the author says makes them happiest. But perhaps we're all just a little shy about doing that in public, and pushing past that can a challenge.