Comment by g3e0

~25Hz is the _lower bound_ for video* to appear smooth, _as long as there is motion blur_. But user interfaces do not add motion blur to moving objects. A computer monitor at 25Hz would be horrendous to use.

Lower framerates are less noticeable in low light, which is another reason why films look acceptable.

*Talented animators/cartoonists can get away with lower framerates