My suspicion is that it is more commonly just vanilla curse of knowledge and people not consciously knowing things that they have very heavily internalised.
Another point worth emphasizing, though, is that there are two parties to an apprenticeship, and each must understand the purpose of the practice, and how each contributes to its success. It's not just great mentors, but also keen apprentices, who've grown gradually scarcer.
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This is no great surprise, of course, and no one is to blame; as cultural practices come to seem obsolete and irrelevant, people forget how to engage in them. A few decades ago, every physics student knew how (and why) to use a slide rule. Now, most can't even recognize one.
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Similarly, there was a time not so very far removed from ours in which many young people took dancing lessons, and learned to waltz (and even to tango, and to cha-cha-cha.) Mathematics students today want to be apprentices about as much as they want to learn to waltz.
End of conversation
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