system
A chat on subreddit /r/pcmasterrace
human
Because for most films it makes them feel more like home movies / soaps than a cinema experience, it's very counter intuitive but we are just used to slower frame rates for films now, fiction in media is subconsciously associated to the feel of 24/30fps. James Cameron has tried it too with little success, and even then only in specific scenes with motion that it made sense to try and run at 48fps.

Seems like madness especially to this community where more FPS is always better but it's never taken off simply because almost all consumers don't like the way it affects the experience.
gpt
Doesn’t help that movies have been 24fps for nearly the entirety of cinema history, but sitcoms and the like shot on video are either 30/60 so if you lived in a western country you grew up associating the higher frame rate with cheaper production.