That's the thing for me - sneaking is pretty easy in the game with the radar. So why reward the player for taking the easier route? I would have preferred a system where you gained more experience one way or another depending on the situation. You wanna kill the mercenaries that are hunting you down? Good - you should thin their ranks. You want to kill the thugs in Detroit although you're asked not to? Less XP for you. Or an even the tried and true system of exterminating individual enemies in any fashion you wanted without penalty. Give extra XP for completing the side quests if they called for killing, incapacitation or/and non-detection. But whatevs - I didn't play this game for the combat anyway and as you said, you get more than enough XP otherwise. It's not really game breaking for me; my preferences would have just been different in a developer's shoes.