People thought it was a bug when you couldn't trade loot (any loot regardless of it's ilvl) from Broken Shore World Bosses but that's still the case now (tested and for sure nobody who got loot was able to trade it whether or not it a piece that was lower I lvl than they had equipped in that slot), now if you join a raid group for Argus World Bosses you can't bonus roll and you cannot receive progress toward weekly quests, plus you also (afaik) cannot trade any of the loot.
Is this Blizzard's way of saying they don't want people spamming group finder with groups for these things (they cause server lag for sure) or are these just bugs that somehow have not been reported enough to get Blizzard's attention?