If you're a writer you should be trying to say something new, but you shouldn't try to make everything new. People would be confused and put off by something that was violating and subverting every trope in fiction, but they would be amused by something that subverts one or two tropes in an interesting way. And subversion isn't even necessary to be good fiction, you could imagine a well executed work that isn't pioneering, but is still quite satisfying.
