I think it's more about curiosity.
Self-taught programmers are, by definition, people who learned by themselves. To be that implicated, you must be passionate or at least very curious about tech; making you more efficient (because less bored and more involved in your projects).
The thing is that "educated" programmers may be people who only care about the work we ask them to do, and only learn languages they were introduced to. So they are less polyvalent and, as I said, Involved.
In my opinion that's all about this curiosity and implication about the dev.
N.B. : some self-taught programmers are only able to do a single HTML/CSS webpage and some educated programmers are people very involved in their work; I do not generalize what I said above
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