Well, I would say modernism and postmodernism are opposing philosophies, much like capitalism, and socialism, and so they clash by default. I would also say RJ quite deliberately set out to create a work, that clashes with past perceptions in a great many ways. My interpretation of TLJ is, that it first rejects and deconstructs the concepts of legends, and heroism, as presented in the first 7 parts of the story, and then reframes it in a postmodern context by the end. I think this clashing of opposing views, is at the heart of the fan division, where many fans view the film as refreshing, and a necessary step in the future development of the franchise, whereas others view it as a betrayal of what came before. For this reason, even if I dislike the direction chosen by RJ, I still believe TLJ is one of the most interesting Star Wars films, and blockbusters in general to date.