Movies have some blur in their frames. Lots of directors have justified this on the basis of looking more “dreamy”. No matter if you buy that or not, the effect tends to allow lower fps to look like smooth motion to our eyes.

It also helps that they lock in that framerate for the whole movie. Your eyes get used to that. When games suddenly jump from 120fps down to 65fps, you can notice that as stutter. Past a certain point, consistency is better than going higher.

Starfield on PC, btw, is a wildly inconsistent game, even on top tier hardware. Todd can go fuck himself.