Which I would understand, but there has been too many times when my raid was forced to comp roll on smuggler items because we had no smugglers in our 16man.
... but it's not guaranteed that all loot drops will be for the classes in the group. ...
I think I probably RE'd close to 30 green armorings yesterday before I learnt the blue version, even though the chance of getting it is 20%. Other times I get it on the first try.
That's the way RNG works, sometimes you get what you want and sometimes it seems as though it's impossible to get what you want even though the odds are stacked in your favor.