The game would be ridiculously easy if we got to wear all exotics lol...that has always bewn how ito works and bungie designs the game around that fact...they would have to either make those items more bland and less unique and/or scale challenges up to compensate...and it's part of making loadout decisions and player builds as well as several other reasons related to game play including the way they drop right now ( the "must have this or that" mentality would be much worse and create a lot of problems within fireteams because of the scaled up difficulty the would be necessary) and it creates a lot of issues that aren't good for the game...exotics are supposed to be rare and unique items that force players to think about how they are playing the game and being able to use them in every slot would completely ruin that