If you don’t learn anything from unpublished drafts, you’re not paying close enough attention.
I’ve written tons of things that have never seen the light of day, many of which probably shouldn’t see the light of day. And I learn something from every single draft.
What works. What doesn’t. What my strengths and weaknesses are.
Inevitably, new ideas emerge for projects that maybe should see the light of day after some careful development.
Publishing what you write doesn’t necessarily make you a better writer. Sure, there’s vulnerability there, but just because you write something doesn’t mean you should publish it. You don’t have to publish to get feedback. I have several go-to people that I trust to read my drafts and give me honest feedback. My work is always better as a result when I do hit publish.
I don’t disagree that there’s a place for publishing your work, but the click bait title of “You don’t learn anything from drafts” feels pushy and obviously incorrect.
That’s not a genuine lesson any writer should learn.