"NONE" of the Beatles settled for being one dimensional writers. Yes he wrote much more complex songs later, but the whole point of my post was to comment on the fact that if he had written more songs that sounded like "John" and "Pauls" AKA ROCK SONGS AKA "TAXMAN" that they could not have ignored him.
Maybe one way they could have done George justice would have been to allow him to do the B-sides for singles. More imaginitively, they could have said to George during the White Album sessions, 'Since there'll be 30 tracks on this one George, we're giving you 7 or 8 slots to show what you've got'. I wonder if Paul ever regrets any of it?