One thing I would be told when somebody in the production, usually somebody with power, wanted a change that I, as the director, didn’t want was: Film is a collaborative medium.
That always annoyed me. So, more or less as a refutation and a joke, I made the following film. “The Reunion of Cyril and John”. For this short film, I acted both parts, did the sound recording, lighting, camera work, directing and editing.
I realize it would be severely limiting to try to make a full length feature film this way, but I think this is a proof in principle that it could be done. So there and take that all you producers trying to interfere with my artistic vision. Screw you.