What they can do is make it so you can only trade items that have dropped when you were in a fireteam with said persons. The division has this in the game. I have had multiple times a exotic dropped after doing a mission and i dropped it or traded it to a player that what in the group I was in. And i think you have like a 2 hour timer to do so also says what 3 people you can trade it to. Bungie can do that same thing.
[quote]add a way to Trade weapons and armor with friends within similar power levels[/quote] That only would open a new way to sell those things for real money. [quote]Add more ways to get weopn and gear ornaments[/quote] It's only cosmetic, no gameplay advantages or whatsoever. It's normal for todays games to pay if you want to look good.