So, it becomes an exercise in futility if you write something that does not express the film as the director wishes. It's still their ball game. It's their show. I think any successful composer learns how to dance around the director's impulses.
In some types of music I'm working out all the chords one bar at a time - the whole structure, because it's about that. And there are other pieces which are really about - okay, the melody is going to start here and play through to here.