The only place I can think of in the US with fiber are university dorms.
Outside of providing a cheap substitute for hardware, the only other use case I can see this for is for MMO's that have drastically changing environments like Rec Room, VR Chat or anything like 2nd Life
Also for most people in the US, 4G has significant usage caps.
Of course this speaks nothing to the average prices these consumers pay. However, its probably a lot cheaper to wire up an area less than the size of California (Japan + Taiwan) with a much more massive population density. If everything else was equal (its not) it would have surprised me for internet to have been more expensive in Japan or Taiwan than in the US.
[0] https://transition.fcc.gov/national-broadband-plan/broadband... [1] https://broadbandnow.com/ATT-speed-test
2. Anything above ~25mbps connection will give you the optimal experience you can have
So no, you do not need Fiber, you just need a decent broadband connection.
While definitely nowhere near the majority of the US, there are many metro areas with large residential fiber to the home (FTTH) deployments. Suggesting it is only available at university dorms is massively misrepresenting reality.
In pretty much all the areas I've lived for the last decade, FTTH has been extremely common. I'm certain lots of other people have had very different experiences from me. Lots of other people have had experiences vastly different from yours.
https://broadbandnow.com/report/fiber-optic-availability-map...
https://www.att.com/shop/internet/gigapower/coverage-map.htm...
Booted up "Just Cause 3" (first one I spotted that was supported and I had). The first bit of the game has you on top of a plane shooting at ground targets.
I'm on a 40Mb/s connection with 22ms of ping to 8.8.8.8. All wired ethernet, no wifi.
The latency was awful, felt like ~1s from mouse move to action. I could not aim at the targets at all.
0/10 unplayable ;)