There are points where we ask why the GM, or the game, didn't help the player more.
As this point only comes up in "exclusively sneak attack immune creature 10ft room dungeon crawl with no non combat interaction at all" I have no problem with it.
Because in every other scenario the rogue brings usefull stuff to the table (the wizard can simply use different spells). And that of course shouldn't mean that he would be useless in combat either, just not throwing around sacks full of D6 around which for some people apparently is the only source of fun in an rpg.