I say we fix it like this... Once you find a year 1 exotic or some legendaries you make them available for purchase in year 2 in the kiosk. 75-100 marks. They come in at 250 and fully upgraded by giving 5 motes and 15 weapon parts. Take away the burns on all of them, heavy, special and primary. Cap the light level at 310 so ppl will still play with year 2 weapons. All weapons work the intended way in strikes and patrols, in raids, however you inflict a curse to the y1 weapon like Curse of Progress or something. It has a 35% chance to jam while reloading. This will make pve overpowered guns in y1 underpowered in y2 and maybe inflict notorious pve weapons like gally to have a 50% chance per rocket to accidentally kill a teammate or themself. In crucible you can keep pvp balanced by further giving y1 weapons a 50% chance to jam and give hidden curses to exotic weapons such as Mida having a chance of stunning you in place while running, snipers blinding the user for 3 sec after a shot, shotguns kickin you in the face taking you down to 5% health or mythoclast draining your supers. For y1 legendaries you can make them increase the time it takes to get your melee and grenade charge back.