Is it everyone gets a piece of loot or is it " a piece of loot for one of the jobs in the party"?
I could see people being upset though (either way) if they wanted to get gear for an dps and they would rather queue or play as a tank. Like if you're in a group and you're all just greeding or you've decided if x item drops y player gets it and they change it so now you need that job in the group for it to have a chance to drop then it sucks.
"When completing a level 51 to 59 dungeon or a level 61 to 69 dungeon, players will always receive one piece of gear equippable by their current class or job."
* Players will not receive gear that is already in their inventory.