Well, yes ... But to be completely fair, i can understand someone who dont play this game too strategicaly to see no reason in "group unstealthing" feature ...
I mean when you want all your characters to stealths, its most likely to ambush something, since you rarely can compeltely avoid things ... (Yes i know you can, but its not too often.) So basicaly all that person would need is to stealth > position > attack.
I still dont understand why cant we change Race for our hirelings. Lets us play Githyanki as racist as they trully are!