365 realistically will be good in 2 raids, Poe, crucible, and nightfalls. People will still raid if new exotics drop especially with xurs new purchasable buff. If you delete any good raid weapons you're silly. I will personally always keep my tdyk, zombie, and final boss for sentimental reasons. People who run out of vault space are hoarders, if you keep more than one of each weapon you clearly haven't used the load out app.