It's true that the phrases "Skyrim NPCs" and "gameplay immersion" don't necessarily go hand in hand. Guards that take arrows to the head, wander around for a minute, and then say, "Huh, guess it was nothing" are very much an immersion-breaking problem.
And in Skyrim VR, that's not something you really want.
This mod deals with these types of issues by tweaking the AI of NPCs to make them act more like real people, which is good unless you like stupid NPCs. To each their own.