I hear your point. I wouldn't personally consider someone who knows what a key or a chord is to be well-studied in music theory. Surely even Kurt Cobain understood which power chords he was playing, for example.

I was referring more to being well read in music theory in the academic sense. I am doubtful McCartney ever picked up a book on the subject. Traveling to meet someone so they can show you how to position your fingers so you can play a B7 chord is a bit different than that in my opinion.