Is that a problem having 1 or 1/2 more level in a way or in another ?
I think it's not... But maybe we should have less experience solving some specific quests with violence because e.g it was something the one that hire you would like to avoid... Or maybe you should miss another quests if you kill a specific NPC that could have stayed alive.
There are many way to balance experience and it could be more satisfying for everyone than just with a limit on kill xp.
What about those that want to play a bad party that's note helping anyone but that want to rob and kill ?
I guess video games could offer many differents way of playing without an easy exagereted unjustified balance.
