The point of this RNG is to keep players playing. They've built a game that's a huge grind and the rng lengthens that game. You won't see a trade for 2 reasons 1. Adding a trade will be exploited by players. RMT will become a thing and Activision doesn't want people taking money from them. 2. Adding trade means a player can get max gear with little effort thus shortening the grind which bungie doesn't want.