It would be cool if we could solo all boss modes on any difficulties. Obviously the rewards would be the same as it is now, like no chests, just carats/exp (exp cat still won't work on solo mode), and it also won't count towards any events centered around completing boss modes. It gives people something to do if they're lagging, or if they just don't feel like playing with people. Because right now it's just normal boss mode, and that's boringly easy, even for people who don't have stats.