A system where, say, 90% of a dungeon is uninstanced but there are two rare spawn named mobs and the only way to get to said named mobs is by finding the keys to their "instances"? You find the keys off of roaming named at 100% drop rate and .2% drop rate off random trash? Then once you have the key you go into your own instance of their room but it could be a placeholder instead of the named and once it's defeated you get ported back to the other side of the door and have to start farming again? I could get behind that. Especially if the keys only drop off of trash in a small vicinity around their "instance" door and it's highly contested. So your group can decide to farmed the contested named or try to farm these highly contested keys.