Most people know that Roger Waters left Pink Floyd because of Roger’s ego and the effect this had on the rest of the band and the working relationships between the people who made up Pink Floyd.
Roger did an interview for 60 Minutes on CBS News and embelished a little, and only a little, on why he left. He simply wanted a different direction for the band compared to the others, in particular, David Gilmour who was the other dominant figure in the band. Saying that, musically, they all brought something special to the table including the wonderful tones and melodies from keyboardish Richard Wright and the spacey drumming from Nick Mason who could set the tone of a song in a few beatings of the skins!
Roger wanted grand theatrical productions like The Wall. David Gilmour wanted musicians on a stage with a few spotlights. Check out the video below.