These sound great in concept, but I agree that they wouldn't serve as dungeons you could find in a roulette.

I'd love to see something like this elsewhere in game, and a deep dungeon might be the way to do it, but 14 has a hard time with exploration in general because there isn't anything for us to find on a micro level if we do just go wandering somewhere. We might see some neat geography, or a place with lore, but there's little reason to explore when there's little to find.