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, wardrobe,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. Sorry to present as arrogant, but collaboration ends at the title “director”.