In which my returning guest and I discuss this: what if The Beatles' songwriting credits were more accurately apportioned to reflect actual significant contributions from not-credited bandmates? Their recording career began with a singular "McCartney-Harrison" credit for "In Spite of All The Danger" - one can make the case (and we do) that their career was book-ended by "I Me Mine," which might have rightfully have bore the same credit. 

Anyway, as always, it leads down many rabbit holes...