The thing is there is no narrative or story telling element to image style transfer. Think of Beethovan's 9th symphony. It develops a narrative its not entirely abstract, the theme of the Song of Brotherhood gets subtly developed through the course of the composition. This is story telling. This is the same reason why its much easier to use ML to generate credible poetry. Generating a real novel with ML faces the same challenges as generating music, even instrumental music has a narrative and a story its telling. Story telling is far more difficult a problem than style transfer.