And not every fight. For example, I took no issues with robbers having no special interaction, as they don't appear later in the game anyway. But for example, if Laez has a further chain of events if you not recruit her, she could still include her, if you left her unconcious. And definitely NPCs should recognise knocked down NPCs as killed. Gothic1&2 managed to find a way to have non-lethal engagements, I am sure Larian can do even better job.
+1