We don't learn from dying IRL so it's realistic!
Hah, joke's on you, I don't even learn from living!
This would be especially nice for those rare occasions when you get killed by something you couldn't even see, but the combat log only logs what your character sees.
Ah, so even if it were visible postmortem, those critical-killshot-from-outside-of-sight-range shots still wouldn't show up in the log? :/ Well, maybe this isn't such a helpful idea after all.