I agree, absolutely.
I think of someone dropping off a stack of poems and then sitting down at the piano and turning them into timeless musical masterpieces - sometime in the length of time it took to play through the song (according to legend). To me, that's Paul McCartney level of musical genius - especially the ability to just keep doing it for decades.
When I was getting started, back in the early '70s, my piano teachers were John Lennon, Paul McCartney, Elton John and Carole King albums and sheet music. I remember how excited I was when I found the book with all of the songs from Goodbye Yellow Brick Road.