Gamers often go for 120-240Hz monitors even.
I felt I was looking at a powerpoint presentation or an animation made at the edge of a (paper) notebook.
This was true even a couple years ago, but these days, most mid-range and above TVs [0], phones [1], and monitors [2] support 120Hz, which is a nice integer multiple of 40Hz. But lots of these devices default to 60Hz (or slower), so you can't really rely on most people having this enabled.
[0]: https://www.rtings.com/tv/tools/table/196699
[1]: https://www.gsmarena.com/results.php3?nDisplayFramesMin=120
They didn't have a choice. It was literally "be fine with it" or "don't play most games". Console players complain now if a game only runs 30fps, because you can't really go back. It's just not possible to play some genres at 30fps.
And this will make most NLE software shit its legs off.
It should, however, reject them gracefully but positively.
How do you figure that?
Broadcast TV is very very very very firmly locked to 25 interlaced frames per second (or 29.97ish in the US where they have to do everything with funny numbers), interlaced to 50 (59.94 US) fields per second.
How could that in any way be VFR?