Level caps are only good for story arcs and quest lines, or things you progress through. A random, capped dungeon? Seems awkward. Whenever I'm doing leves on a lower level class and I see an open world NM I switch over to r50 and see if I get anything that might be useful, borderline same concept. I don't feel like a bad person after.. It's what you might call an advantage I gain for putting in the time to get a r50 in the first place.