What's better, a gallery exhibition of 20 photographs or 2000? It doesn't work that way.
24fps is not a bad framerate.
The debate about 24fps vs higher frame rates is nuanced. It's about trade-offs and style choices. Here's an example of a videos discussing 24fps vs higher frame rates:
https://www.youtube.com/watch?v=WIo7jwsYbxc https://www.youtube.com/watch?v=e6HZPmSlS5c
What's worse, how do you intend to display 24 Hz content on a 60 Hz monitor for example? Display one content frame on every 2nd or 3rd monitor frame? That will lead to speedup / slowdown. Maybe display one content frame every 3rd monitor frame, but drop every 6th content frame? That will display the content at proper speed but the result will be a jerky watching experience. Maybe think about interpolating the content by computing in-between frames dynamically? I'm not sure to what extent this is done in existing devices, but I'm positive the watching experience won't be optimal.
If it was somehow proven that the human perception system "samples" individual frames at a fixed framerate of 24 Hz, then you could make a case that 24 Hz is preferable to 30 Hz, but I'm pretty sure that is not the case.
I remember playing Halo on the original Xbox. I was distracted for weeks because it was an unpleasant jerky experience. About once per second there was an annoying jerk when just walking in a straight line. At some point I noticed that on a friend's Xbox Halo ran very smooth - at least during scenes that hadn't a lot of action going on. I was already considering that his Xbox was a newer, stronger model, but then I noticed my friend had his Xbox set to NTSC mode. I'm from Germany, where as most of Europe the usual video system was PAL (slightly higher resolution and running at 60 Hz instead of NTSC which runs at 50 Hz). I set my console to NTSC for Halo and it fixed my issue. The whole thing might be an issue in Halo's engine, maybe they weren't able to fix this in time before the release. Or I don't know, fixing it might have caused huge headaches with multiplayer. In any case this situation might illustrate why you don't want to put 24 Hz video on a 60 Hz screen if you can have 30 Hz video.
(Back in the cathode days seeing a TV set in Europe was like going to a strobe show.)
As TFA says (well maybe it was in the comments) there are standard ways of conversion and you pretty much hit them but newer equipment will be able to playback 24fps natively to give the “cinema experience”.
Maybe then what Halo did, was simply to compute 60 frames and throw the last 10 away...
Yes, it doesn't work that way, the number of frames you have and the number of pictures you select for a gallery exhibition are two totally different things, the only thing that they have in common is that both are a number of pictures. Unless you consume video content by pausing and watching it frame by frame, which I doubt you do. And even in that case, a lower framerate doesn't equal more "work" being put into each frames, which would be the case for the gallery exhibition, but isn't the case for "livestreaming", since you don't have the time to do that when doing something live.