This link will explain why we need trading and why it would be put in a MMORPG game.
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Something needs to be done. But I don't agree with everything that video says. One of his first points in that video is that it adds play time. It could also easily destroy the amount of playtime for players. If you have a new player just starting the game and he plays the story and reaches 20. That player then has a friend who has played for months and is level 32 and sitting on a trove of unused exotic and legendary gear they have built up. They give their unused exotics and legendary and ascendant materials to the new player and then he almost instantly becomes level 32. What would have been potentially 100s of hours of playing to acquire that gear himself is instead a few hours and then it is handed to him by a friend. What incentive does that new player have to keep playing now? They just hit max level and got the best gear in what could easily be under 30 hours.