beginner artist/programmer combo here, I am sure this type of tools can be very powerfull for prototyping the moods of 2d games, if not parts of 3d games, as for its limitations this method do get the general scene mood rather well. Anyway far better than that shitty programmer art placeholders. The process could let game devs be many times faster and better at finding the right mood in a game, just swapping out the images the program learns from to find a new mood theme for the game got an level of intuitive logic to it, that I am sure can make it very accessible to non technicals. A well made tool of this type would be very good in the early prototyping pipe line for 2d games and more. Would not make even really bad artists jobless, but in the case of specific jobs it would be a powerful tool.