Comment by Izkata

Personal guess based on the impression I get from my parents' TV: You know how when you pause video while something is moving quickly, that object is blurred in the frame? Motion smoothing has that to work with, and causes the blur to persist longer than it should, which is why it looks bizarre - you're seeing motion blurs for larger movements than what's actually happening. Like the object should have moved twice the distance for the amount of blur, but it didn't. Something recorded and replayed at a high framerate wouldn't have this problem.