I almost got to see the Wall when it was originally preformed in NYC. But my mother said no way. My aunt worked in the broadcast business and had tickets. She was going to give me the ticket as a birthday present and escort me as well. My aunt was a hippy of about 22 at the time. As I recall my mother said" Uh, no no no no nooooo." But for some reason I wasnt entirely disappointed. Even at the young age I was I felt that Pink Floyd had lost their lost their edge. I wasnt into the wall at all. I bought the album right away and felt let down, I felt the same way about Led Zepplins In Through the Out Door. WTF was that all about.
I like some of the wall now, it has grown on me and aged I guess. But I understand a little bit about waht happens. Many of these bands are hungry and angry, it comes across in their work. Later after they are successful they get their fill, they have shot their load so to speak. Then the creativity either slows down or has to change. Thats no doubt where the tension between band members comes from I think.
Doing something creative, anything creative collaboratively is hard no matter what, friendships will be strained.