The original quote: "Dungeons - the Underworld - are the Realm of Chaos. Chaos doesn't make sense"
If it doesn't make sense, it can't be extrapolated from. Any learning from this location is inapplicable to any other except perhaps through random chance which means players cannot build expertise. Can the chaos riddle a theme and affect a locale but leave enough sense for the players to make meaningful choices? Sure. If the sense if left enough across locales then it is no longer the Realm of Chaos, is it?
Well, I meant "doesn't make sense from the perspective of Law" - it can have its own internal logic, of course.