Lurking between the lines in arguments about AI writing/code/art is that whether or not an activity is "gym" or "job" is often in the eye of the beholder.
People who never "went to the gym" in a field are all too eager to brush off the entire design space as pure Job that can and should be fully delegated to AI posthaste.
That's why the whole thing has to start with you identifying what you consider core to yourself.