One of the very interesting things about film and theater productions is that they must be collaborative. I had tried to write a number of novels, but they had numerous problems for the reader... too long, too pedantic. Then I tried to write a play. The feedback at the cold readings told me a lot, including, sadly, that people were making one of my 'heroes' into a bad gal (she was a she) because of stereotyping. Questions to my audience showed they didn't care a whit what she said or did, or that she was consistently helpful. She stood up to some people, and there were traits she had that labeled her a 'bad guy.' That was not even sci fi, let alone Trek, but it was an education.
I wonder if any of you have done cold readings of your film scripts in front of an audience to test them?