This is mostly a personal stance validated by the talking of some other artists and musicians, and only a weak rebuttal/addendum to your point: But I've long understood creativity as literally just creating. A lot. And publishing only what you deem worthy.

I'm friends with a clique of techno producers and they grind their music 24/7, they have an endless supply of ideas that they've produced,they're also heavily immersed in the music etc. They will publish some tracks twice a year, to the outside it obviously seems like they've had a moment of genius, but it's probably just 5% of their actual production. Another example is the documentary on marina abramovich, where she has a consultant telling her what art to actually publish. The artist Jonathan Meese has outlined a similar stance on a Tracks documentary where he just rambles for 5min to the effect of "create create create".

Obviously doing something a lot develops skill, but choosing what to publish is probably more a question of taste.

Jazz soloing is probably a good counterexample, but a lot of jazz solos aren't that remarkable and these people are at the top of their game so their worst is likely most peoples best?