Also, let's not forget that at least in the current build, at times "winning a roll and avoiding combat entirely" is the option that pays way less exp and items, compared to the alternative.
XP-for-kills is a major fault-line when it comes to encouraging variety in RPG gameplay.
IIRC, the early versions of DnD rewarded most of the XP for the value of the treasure when you collect it, rather than for killing creatures. It sounds a little strange, but it meant that you could use either lethal or non-lethal ways to advance.
