I would say that maybe directors who act as well are easier with actors. I'm not saying that all directors have this, but sometimes you'll come across a director who sort of looks at an actor a bit like a kind of untrained horse that's been let out of the stable, like they might buck him.
You can say what you want to about a rapper in a movie, but look at what Ice Cube has done. Ice Cube has created more opportunities for other actors to get jobs in this business than some actors have.

