Some trading, even if it was very limited would still be nice, like an exotic for exotic or legendary for legendary that you could do once every few weeks, or once a month. It just feels like such a waste having to shard exotics that friends need, I've gotten 6 of each ghorn, thunderlord, and dragon's breath, and duplicates of quite a few other exotics, it felt like such a waste having to shard them when I have friends that need them. Sure, with any sort of trading people would look for ways to exploit and abuse it, but if it was very limited I think it could work, not that it will happen, but just saying it could work if done the right way.