Even if AI could perfectly produce art for a video game - it would lack a lot of what makes indie games charming.
Part of that discovery process is so valuable to the charm. "I don't know how to do art! The fuck is this shit! How do I 3d model? I guess that works, it'll do. Hey actually it'd be kinda cool if I based the general aesthetic of the game around this kinda look." Boom, unique art emerging from their constraints. They had to work to get there, but their work is infinitely more artful as a result