I can see that. Although . . . among the people I've met who only wanted to write because of some fantasy of being A Writer were some of the most prolific writers I've come across.

It's just that they were prolific but horrible.

I suspect that there are a lot of people who really aren't writers who actually do produce a lot specifically because they don't have any kind of internal quality-control.

None of them could take criticism or improve, though.