That is not correct as some of the comments suggest. Typically experts are designated as persons whose mastery of a craft extends beyond memorization such that

That is not correct as some of the comments suggest. Typically experts are designated as persons whose mastery of a craft extends beyond memorization such that they have forgotten the specifics of things learned as confidence and muscle memory have replaced memory recall. They are at one end of the Dunning-Kruger paradigm in that they have forgotten things learned, or avoided things unnecessary or anti-pattern, resulting in gaps of explanation that are not present at time of performance. It is beginners that are reliant upon memorization because they have not yet achieved the practiced mastery sufficient to perform with immediacy otherwise.