Or, to channel an old martial arts conceit:

>There are masters of a thing, and then there are masters of a thing.

Where the difference is, some folks can do, but can't teach/communicate what they do or how they do it, while other folks have both mastered a skill, and are able to raise others up in how to also learn that skill.

My guitar-playing friend also would wear out cassette tapes and records playing back specific sequences working out how they had been played, and perfecting his technique....