I still don’t think Loot Trading is necessary in any form. I think a disclaimer before opening a ticket, telling players that under no circumstance will mislooted items be moved from one player to another and that opening tickets for that purpose is a misuse of the ticket system is a better idea.
Loot Trading, even in raids, changes the looting dynamics. With this system in place, the Master Looter will be able to hold onto multiple bosses worth of loot to better distribute the loot.
Say for example; a Quick Strike Ring drops and a Rogue wants it. The Master Looter holds onto the ring and when they defeat Ragnaros, Perdition’s Blade drops. Perdition’s Blade is a larger upgrade for the Rogue, so he gets the dagger while the ring goes to a DPS Warrior. I guess this could also be done by leaving the loot on the boss but that’s much more of a hassle and I don’t know how long the loot remains on a fallen raid boss in Vanilla.
Just my opinion. It’s a lot better now, but I personally don’t think it’s a necessary system.