"if you can't do, teach" is bs. effective teaching often requires mastery of a given subject beyond what's needed to "do"
the actual thing going on in the world is: "if you can't do, micromanage those who can"
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The way I understood that saying is similar to Peter principle: it's harder to determine whether someone's teaching well (or, it's socially harder to accept that that's not the case) so we end up with people "failing upward" into teaching. Do people actually treat it seriously?
