First I've heard.
What are your sources for this?
The world's TV and cinema industries are converging on 24 fps.
My sources are my studies in electronic, specifically the electronic signals.
People usually do the mistake to compare the video games with the cinema.
The cinema movies are indeed shown at 24 or 25 FPS. But unlike the video games frames, the cinema frames are "motion blurred", meaning that there is some blur of the picture (just like when you take a picture of a moving person with your photo-camera) that helps the human eye (brain) building a smooth transition from a frame to the next.
In video games however, at least in FSX, we do not have any motion blur effect, each frame is pefectly crisp. As a consequence, the human eye sees the transition from a frame to the next quite easilly, and this is why we perceive the "stuttering".
Because of that, if our eyes look at a video game running at 25 FPS, it will not be perfectly smooth. If the video game runs at 30 FPS, it will be better, and if it runs higher, it will be even better, because the eye will be less and less able to spot the transition from a frame to the next.
That being said, if we would have some kind of good motion blur effect in the game, then even at 25 FPS it would be perceived as perfectly smooth. But since we do not have that, we need more FPS to compensate
