I believe Lucas is bitter about American Graffiti and/or THX-1138 and how they edited some of those movies, and he had no say in how he wanted the final cut. I understand his point, as an artist, he wants to make his movie, but the studio is worried about the bottom line, so want essentially their movie. The ironic thing is that when Lucas financed his SW movies, it was himself who was worried about the bottom line and how it appealed to fans instead of making the movie he wanted to make.