That's totally fine if that's the way you want to play. Many people want to collect. I don't think it's too much to ask of a loot-based game to provide a way to collect all the loot the game has to offer. Forcing people to destroy the loot they gained makes the whole game feel pointless. Why grind if it will have to be dismantled anyway? Then Bungie loses. We lose. Not good for business.