do you think taking a photo of something is skipping to the end goal of painting? no. it will just be used as a tool for more creativity for the people who will do the work.
Going outside and taking a photo requires you to be engaging with the scene around you. You are the actor doing the thing. When you prompt an AI, the AI is the actor doing the thing.
Not to mention that many directors also write the script for the film.
N.B. If directing people is the distinguishing factor, then animation directors are robbed of their claim to artistry as well, as is basically any solo artist in history