I've called this concept in teaching "remembering the struggle". If a person is so far removed or such an expert in a field, they may not even remember what a person trips up on when they first get started. They may even have been so talented they didn't even been tripped up at all. Lacking this ability to empathize and relate can make teaching very difficult.
I remember very well the painful process of my dad trying to teach me to drive stick shift (on his new truck). He never mentioned that the clutch had a catch point (that wasn't all the way at the floor), but gave instructions that really hinged on that fact (give it gas, let it out slowly at first, etc). After an hour of us being very frusrated, I went out alone and taught myself.
I later taught two friends, explaining the clutch's catch point, and they were 'getting it' within a couple of minutes. A few accidental stalls, sure, but they understood why. 20 minutes or so and they were legitimately ready to drive on the road (both had been driving automatics for years).
My dad had already been driving for 40 years, he totally forgot the catch point even exists.
