I'd been playing for a while now, and my wife plays as well. The one thing I've noticed is the fact that class-based items aren't entirely exclusive to the class you're playing when it comes to what you get from engrams.
My wife primarily plays a Warlock, and it seems all I get from engrams is Warlock armor.
So my suggestion is this: Why not be able to give our unwanted items to someone else? We have a mailbox, so why can't we mail things to other people, even items?
I have a few warlock items that I'd just LOVE to give my wife to help her out, but have no way to.
Would this even be feasible at all?
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A trading or gifting system would be abused. There's already people advertising carrying people through Hard Crota and selling checkpoints for cash 'donations'. Not going to happen.