The difference between the artist and the 14 year old is the former has artistic vision and style. If a 14 year old can master prompt engineering, so can the artist.
Doesn't this artistic vision and style boil down to taste, anyway? Claiming that the skill of the artist and the skill of the editor is identical is obviously wrong.
edit: in a way, making a work that targets a particular audience is an acknowledgement that the public has largely set the vision and style, and the artist is actually adept at working within it.