I highly suggest allowing us players to use as many exotics as we own in PvE because since I earned my exotics (except for the random second icebreaker I got in the mail), I found that I really only use one of them mainly and the others just sit there in case I ever need it. We shouldn't be limited on the weapons and armor we use to fight the darkness. We need to be able to use our best weapons and armor against the hardest of enemies. Keep one at a time in crucible, because that's like sparring and I'm not going to deck the brains out of my sparring partner. The only reason I find there to be a limit on exotics is that bungie made it for crucible but didn't want to take the time to change it for PvE. You also may think it's overpowered, but war is simply about overpowering. That's how you win.