Of all the Beatles I think it was Paul who most consistantly dedicated himself to his music. Whatever distractions came his way, he continued to be a musician first and foremost. I get the feeling from all I've read that John and George liked touring as Beatles the least once the novelty wore off for them. Paul willingly and happily gives himself to his audience. The other three Beatles are/were less enthusiastic about being the center of attention.Not to slight any of them, I love them all for being my first favorite band!
And I think it was Paul's dedication that kept the Beatles busy near the end - especially from MMT to ABBEY ROAD. Watching the LET IT BE film, and hearing the many Get Back sessions/rehearsals tapes, you can sense Paul's frustration. I think he badly wanted the band to continue, and because of that may have gotten too pushy.
I don't recall Paul ever trying to tell George how to play a Harrisong, but he did get on George a bit through a rehearsal of John's DON'T LET ME DOWN. A small bit of that argument is edited into part of the TWO OF US argument seen in LET IT BE.
Still, all too often discussion of these sessions focuses in on the unhappy moments. There were some rather pleasant moments as well where the guys are obviously having fun jamming and chatting. There's a humorous bit of dialog where they discuss making a film and who could play what part. There's also a rehearsal of SOMETHING where George asks "What could it be, Paul? Something in the way she moves attracts me like a...." John suggests "cauliflower" and Ringo says "screwdriver". George decides upon 'pomegranite" for the time being.