My original statement was a response to someone think he is funny by comparing 15 fps to 30 fps, but some people tend to get triggered by their own imagination instead of my actual point
Saying something is minimal doesn't mean it has to be that way, higher is obviously better, however framerate below 24 fps felt like power point presentation instead of animation. the difference between 30 fps and 15 fps is much greater than comparing 60 fps to 30 fps. My point never was disregarding higher framerate being smoother, in fact I prefer higher framerate, but if framerate has to be cut for better fidelity, there should be a minimal threshold.
The reason that film industry use 24fps was originally a compromise for saving film stock cost, but why they stopped at 24 fps but not anything below is because after years of trial and error they found that 24fps is as low as it could get for the audience to still perceive the motion, anything below that creates uncomfortableness.
When someone is trying to make himself look clever by saying sarcastic nonsense like "hey why stop at 30 fps, let's do 15 fps" he had no idea what he was talking about (he later had to edit it by adding "15 fps keeps the illusion of motion" to make himself look less silly, which just proved my point). While its difficult to determine the maximum threshold of frame rate for our eyes, it way easier to determine the minimal threshold
