Are you actually saying you turn motion smoothing on for movies, tv shows, etc? Again, are you being serious or am I misunderstanding something?
I can't understand why anybody would do that. It's a crime. It's hideous. It's not what the artists intended, and it looks like total garbage. There's no "good" motion smoothing, except I understand some like it for video games or sports. But films? TV shows?
The best settings for a TV are as neutral as possible. When you buy a TV, just turn all that crap in the settings to OFF, and then do slight adjustments to brightness, blacks, or contrast depending on the brightness of your room or if something seems slightly off about how things are looking.
I can't believe I'd need to say this on a David Lynch forum, but motion smoothing is a complete disaster. It's a disgusting and ugly manipulation of the frame rate of the piece of art you're engaging in, affecting all nuances of it, the timing, the motion, the movement, the feeling. You might as well smear diaper shit on the screen. Though I'd actually prefer that to changing the frame rate.