I only really enjoy WFC mapgens, simply because structures they come up with are largely driven by modular pieces and that produces interesting results for longer time (for me personally). I find noise/biome/temperature driven open-world worldgens boring af, and I get a feeling I’ve seen it all very very fast. AI can potentially produce unique structures in open-world worldgens way better than noise-based algorithms with basic heuristics on top of them. You mentioned quests, just consider that AI-based worldgen can generate/modify world based on those characters and quests. You can ask it to start with noises, then modify to arrange for villages/cities, then make sure there is nice road from village A to village B and landscape is modified to make this road nicely traversable, and if there is a quest, modify map in a way that the needed dungeon happens according to intended progression in the mountain between those villages, etc.