I agree would be cool. Makes it easier for those characters uncomfortable with killing to roleplay their anger/disgust at their comrades.
As a crew member we did this in Wolfgang, and it was interesting to see how these “christian” players dealt with the dead villagers, and the dead bodies didn’t dissapear until we had been dealt with. Indeed the GMs wanted the NPC to report back, to know how it was done and by who. I recall being bemused that they gave one guy some rites but just threw me in the pile.
Sometimes its hard to phys rep the stinking bodies of the following morning, and if its not phys rep, then its way too easy for the players to forget all about them. Well, I do anyway - memory=sieve. I recall some bishops(?) in Wolfgang arriving and making some comments about the stink and most players looking a bit abashed.
I guess this comes back to how the GMs want to treat the relative importance of casual death wrt plot lines, and most people take their cue from that. Since I’ve not GMed combat game, I do wonder whether it is something consciously decided upon about the style of their game, or if the default setting just applies.
To me, its more about the situations where players maybe go seeking fights with perhaps an overly casual attitude to it, that seems more grounded in OOC considerations than IC.

This point was driven home by the Woodsman Massacre incident on Sunday morning.