Problem with need(companion) button is that you don't know if that person REALLY needs that item for companion. So, soon, the need(companion) button could become greed button.
They should just grey the need button for classes that can't use the item.
They helped down the boss, so why is it your business what they need the item for?
Loot bags needs to be an option for every grouping situation, all you greedy 'player first or blacklist' jerks are keeping the companion system from being fully realized.