. Already stealing is tough and fun 'cos of the cones and people walking around.
Or you use walk in shadows, then it is too easy.
Ah forgot about that one... even if you walk in shadows, you should pass some of detection check. Like some of the sharper-eyed characters(high wits) would notice things are missing or some outline in the shadows. Maybe they get a qn mark over their head. Plus if you're moving around in water, blood, etc., people would notice some movement. (Ok, maybe the last one is too demanding for Larian Studios.)