The gist is that, for animation, frame interpolation messes with intended timing and can produce incoherent images on interpolated frames and odd frame rate issues for certain kinds of animations. Interpolation can thus cause animations to lose their punch and feel wrong.
While interpolation may be nice for live action films, it should still be an option to turn off.
Without motion smoothing, the model shots still look reasonably convincing 40 years later.
With motion smoothing, it looks like a low-budget B-movie.
I don't mind if a film is shot at a higher frame rate and then displayed that way, but interpolating additional frames looks terrible, and I don't know why any manufacturer turns it on by default anymore.
Let's remove that feature to get rid of that dark dark stain on high-FPS content and let platforms and content creators decide where it fits and where it doesn't.