Personally, I think Harrison has a weirdest history with the Beatles. He seemed the most dismissive of it after the fact, but I also get the feeling he would have been happy to have kept going indefinitely with his one or two songs per album. Like, I don’t think he liked the crazy attention surrounding the Beatles, but, ironically, it was easier to hide in the background as Beatle George than be center of attention as Frontman George. I think that’s why he enjoyed being a part of the Wilbury’s too. He was playing with friends for fun, but he was just a part of the group and not the main person.
I have nothing to back this up. Just the vibe I’ve gotten.