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. ↗
Composers in the old days used to keep strictly to the base of the theme, as their real subject. Beethoven varies the melody, harmony and rhythms so beautifully. ↗
Other, far fewer, directors are more like the composer - conceptualizing the piece, scoring it, distributing its musical lines among a range of registers, chords, and instruments. ↗
I can think and play stuff in classical music that possibly violinists who didn't have access to other types of music could never do. It means I'm more flexible within classical music, to be a servant to the composer. ↗