AI is already in a bunch of creative workflows. Just look at modern Photoshop. Selecting and hitting delete has AI infill for the background replacement.

Creates can these video gen AI in various ways. There are some youtube channels of people using these in creative workflows that are really impressive, from mocap replacement, character insertion, background replacement, changing camera angle in post, animating/inserting characters from character boards, animated between stills generated in traditional methods, etc. It's not just "prompt and generate". It can be, because it's easy, but it also doesn't have to be. It's a tool.