Trading should only be available in the post-game loot screen.
Let's say a fireteam goes into nightfall and at the end a titan is rewarded with an item that the Warlock wants and the titan doesn't need/already has. The Warlock wasn't awarded this item, yet. They helped and did just as much work to obtain the item ans anyone else on the fireteam. If anything the Warlock is part of the reason that the titan earned It.
Now, If the titan could just give this item to the Warlock he played with, then the Warlock would be happy and his titan friend would be glad to give the item to someone who actually needed it.
The Warlock was in the nightfall. They earned it. It was just awarded to another person.
Trading should certainly not be open. There are too many issues that can come Into play with an open Trading system. However, this simple addition of being able to trade post-game loot with those that completed the mission with you will help to make sure more players receive the items they want, and will make the current loot system a bit more bearable, without adding in all of the problems of a full game economy.
English
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I only read the first part but this^^
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^He should read all of it.