[ElectricalUnion]

Assuming you can generate 24fps of "movie quality perfect images", but you can't.

Let's take motion blur as an example: It's a very expensive to do it as a real-time VFX - so we cheat and approximate it - that doesn't that look good most of the time - because we often have to cut too many corners and end up with a poor approximation.

You're generating very slow images that a computer believes is a facsimile of reality that, unfortunately, don't represent motion blur very well, so they might be "24fps", but they look wrong compared to reality, and you probably can't conscientiously tell what is wrong, just that something seems to be sightly off.

So it's easier instead to attack the problem from the other side, and generate (or frame generate, that's a thing now) and show 480fps "crisp images" and make human persistence of vision do actual motion blur for you.