yeah this is a long running issue in divinity 1 and 2 as well.
It's too common for any player in div (at least in multiplayer) to kill all the map's npc before leaving the map for good!! I mean there is hardly any downside to it!

suggestions:

as it might be hard for them to implant a calculation on kill vs quest reward xp, I suggest they give xp on the "encounter"!
so if you survive a fight encounter regardless of how it ended you will be rewarded the same amount of xp as talking it out.

also if you stealing or mugging you will get no xp for it so it will balance out the players that choose not to do it. (but you will be mugging a person for goods so that is a reward for itself! )

Last edited by Weekend; 09/10/20 10:18 PM.