You have to understand that people feel threatened by a writer. It's very curious. He knows something they don't know. He knows how to write, and that's a subtle, disturbing quality he has. Some directors without even knowing it, resent the writer in the same way Bob Hope might resent the fact he ain't funny without twelve guys writing the jokes. The director knows the script he is carrying around on the set every day was written by someone, and that's just not something that all directors easily digest.