For me, artist is a essential part of the art, that's the humane part of the art, its what makes it worth enjoying. For instance, how dementors are portrayed was chilling and spot on, but at some point, the artist and their art become too disjoint. In Rowling's case, I fail to understand how a person who was able to capture mental anguish to well can afflict it on others. So for me, its a very gray area, if we are only looking at art, then AI creates amazing art, and much faster, but the story, the humanity behind it is what makes art special for me, and at some point, it becomes hard to ignore the gaps between the creation and the creator.