I'm not sure everyone typing here gets the notion of "director" or "producer," in relation to "composer." We certainly ought to have sincere, developed opinions about music. It's also fair for us to propose, even argue a bit if we think something is artistically over-used or tiresome.
But I, at least, am no Harrison Ford. I think my job at times is to try to understand why they are asking for something and what I can do that substitutes something a bit less hackneyed that, nevertheless, does what they want.
It's Not a Symphony...
Most of us are actually on a project for a fraction of the time that the people who hire us are on it. Video games take four years of sometimes thousands of people. Films sometimes get developed over an even longer time. Television? Those people work themselves to death (as do we).
And furthermore, as creative people who come in at the end, we sometimes can, graciously, offer a fresh perspective on a scene or even the whole project.
...And PhDs Not Required
As the last (usually) to join the team, we are collaborators, not dictators. I think my job is sometimes to throw out everything I ever learned about music, from bar bands to Buxtehude, and try to "start over" from my colleagues' or the audience's point of view.
But to return to points others have made, when an "epic" choir shows up, one has to be careful that it's not inadvertently creating a parody.