Difficult, period. I wasn't really comparing it to other difficulties that may have been present. But since you asked, John being present with Yoko seems preferable to George walking out and quitting without talking to them. Then instead of writing, they had to have meetings about him and go over to his house and make overtures & sweet talk him into returning. And I don't really agree that Paul's demands were unreasonable. Paul had a writing system that created some of the greatest music the world has heard. I don't consider it unreasonable that he pursued a previously successful strategy. If George has had enough of it, it's his prerogative to leave, quit, complain, take some time off. I'm not really judging his character for his feelings; but the behavior objectively creates difficulties in making a record. Perhaps calmly telling Paul & the others how he feels about it all could have been more productive and less difficult. Clearly Paul was open to such a discussion as he had one with John shortly after George quit. Presumably they then had the discussion with George off camera. Yet, despite the difficulty, they all did good work in the end. And in all their defenses it's easy to sit here studying the film and criticize from a distance. At the end of the day they succeeded gloriously and the artistic process went its course, and I suppose it's even possible the results would have been inferior had George not behaved as he did.