Even in the wonderland of fiber, South Korea, fiber to the home has slowed down and fiber to the building is common. Korea Telecom still has lots of coaxial setups they stretch into gigabit speeds using 1:N connections. Gigabit penetration in Seoul was still below 50% few years back, much lower elsewhere.
Btw. Fiber has no latency advantage. What you need is servers at edge in both use cases.
Fiber has a latency advantage in real world usage. In the common scenario of multiple computers and users sharing a single connection, if one of them does something latency sensitive (gaming or video chat), he will be bothered a lot less by others heavy bandwidth use on fiber than on ADSL, or in a lesser measure cable.
That's because heavy bandwidth use (downloads, video streaming) will saturate a low bandwidth link and packets will drop. Or bufferbloat will increase latency without dropping, which is the same for latency sensitive usage.
With multiple video streams going on in the average household being a common case nowadays, it's nice to have enough bandwidth.
