Both Oblivion and Skyrim had this issue, and I was amused to see it carry over into this game. When you sneak into a house, even if you remain hidden enough to steal items and pickpocket, NPCs will still repeatedly ask you to leave as if they are fully aware of your presence from the moment you walk through the door. Is this even avoidable? There isn't much impact on the mechanics of thieving, but it detracts from the enjoyment of breaking into homes quite a bit for that reason. Not a major quibble for an otherwise awesome update, but it would make me very happy if they were able to fix this.