He told Vanity Fair magazine: "This is for Scott [Stuber] and Ted [Sarandos] and everyone who runs Netflix: Could you not afford to have a longer theatrical release? Maybe not. I don't know. I'm positioning this as a question publicly in Vanity Fair. I haven't actually had this conversation with them, but I would and I will.
"Unless you have a Marvel star, financing any film is very, very, very, very difficult — no matter how important the story, no matter how urgent the story, no matter how talented and awarded and appreciated the artist is."
In "The Power of the Dog", Cumberbatch - who is married to theatre director Sophie Hunter and has Christopher, 6, Hal, 4 and Finn, 3, with her - plays closeted ranch owner Phil Burbank, who develops a nasty streak when his brother marries a widow and she brings her effeminate son to live with them in 1920s Montana.
Cumberbatch - who has been nominated for an Oscar for his role in the movie - also explained that despite being a straight man, his lived experience is not completely different to that of his character.
He said: "While my lived experience is very far from Phil Burbank's, that's not to say that all of it is. I don't want to sound defensive because I'm not. This is coming from a cultural questioning of appropriation, and that's something I'm very supportive of as a producer and an actor."