It's not the underwear either, it's the "voiceover" person, was already there in the original too.
And yes, it gets annoying real fast.
Wrong - the only reason you hear a voice when you steal is zandalors underpants. They talk to you. There is no voiceover person commenting on your behaviour. If you don't wear the pants you won't hear the ranting anymore.
This didn't change in the Enhanced Edition. It was the same in the original game, too. --> You are lying - there is no voiceover person and there never was one.