I mean, if you are directing actors to do one thing and then directing them to do something else entirely because the one thing you wanted them to do may not work, then you are just shattering their confidence in the project.
“I grew up in Kentucky, but I did not grow up like that. I had heat, and I didn't have to shoot my dinner or anything.”
“For success, the author must make the reader care about the destiny of the principals, and sustain this anxiety, or suspense, for about 100,000 words.”