large part of the value of art and film, is the question of what the creator was conveying in their work, and often that is a complex tapestry for the viewer to ponder.
The consideration of huh did this frame in the film intend to mean this, it feels the painter frame the scene in this way to draw my eye directly to the skull, we pick up on details and are forever in relation to art with "is this intentional, a lucky accident of unintentional that became intentional, or is it just my own reading of it that means the art speaks to me on another level".
All of that does not exist for ai output. There is absolute certainty in the viewer that the ai had no intention behind anything. It is bereft of meaning except "this is meaningless noise meant to stand in for skill which costs money"