Intuition and internalization—the very things that help one “move fast” within their area of expertise—are the things that most inhibit one from producing clear, comprehensible explanations when teaching non-experts.
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I agree that the latter is harmful if you're trying to explain the concept, because you don't do the extra work to gain an understanding. So you can't articulate that thought process. I presume it's also why "geniuses" can sometimes be utterly useless at teaching.
