I personally think they need to have the AI basing its difficulty on what the stats would be for a group of 5 all outfitted with a full set of rare armor, weapons, and trinkets for whatever level requirement the dungeon is. Rare’s aren’t hard to get and would also reward those that have exotics at the higher level dungeons. In doing so, they wouldn’t alienate those that are leveling up and wanting to partake in dungeons at that level.