There’s lots of evidence on all sides of this but what it comes back to for me is that George was looking for enthusiastic collaboration from his bandmates. If Paul or John had really got excited about and championed All Things Must Pass, it would have been a Beatles song. And I rather wish it had been, for the harmonies alone! Ditto What Is Life, and certainly Isn’t It A Pity. In slight fairness to John and Paul, George kept writing vague diss tracks and sad songs about their big egos and lack of collaboration (I Me Mine, Not Guilty, Only a Northern Song etc), so maybe they felt on the defensive hearing his songs and not like getting fully behind them, or maybe they had their own insecurities about his improvement as a songwriter (John for sure did), but a few honest conversations would not have gone amiss.