I just had a thought.

I haven't played with a rogue in this game yet, and I refuse to bring Astarion into my main party. But I assume that since height advantage exists, a rogue on high ground will basically get sneak attack damage no matter what, right? If this remains, imagine how nasty that would be when we reach Baldur's Gate and we are likely to run into ENEMY rogue archers. Not exactly a concept that would be very creative.