This was a concern very much at the forefront of Gavin O’Connor’s mind when he was first starting to make The Accountant and was looking at Ben Affleck to star — but it wound up being a situation that fully defused itself in the first phone call between the two men.
On the set of a film, the director is king.
As such, you might see why a director might be nervous about casting an actor who is also a filmmaker — fearing that they might try and be a bit too forceful with their thoughts.
He or she is the one who ultimately calls all the shots and makes all the decisions, and while different filmmakers allow different amounts of opinion on their sets, the final call in basically every situation is there.