Once learned, some bits on knowledge are so intrinsic to one's job or skill that one cannot remember what it felt like without that knowledge (and therefore difficult to document or teach to newcomers).
What is the name for this phenomenon?
Learn English – Term for knowledge that is unintuitive but obvious in retrospect
word-choice
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Best Answer
I would call it tacit or implicit knowledge, for which a good definition is
That seems to fit OP's context very well, in that it's not easily communicated to others.