The reason wifi is more common in the US has to do with cost.

Most people when buying a new house can stomach (not sure why, because it can't be a large portion of the overall cost of a new house) multi-line pulls from each room to a central wiring closet. Plus, you have to have that central closet (or panel at a minimum) somewhere out of the way, and most people just don't get that kind of tech (the idea of a central area for a home server, plus networking stuff, etc).

So - the lines aren't installed (at one time, houses were offered with the option, and if you are willing to pay today, you can still get it - but most people don't). After the fact retrofits aren't done because such an install is very difficult to do (especially in modern houses with horizontal firebreaks between the verticals, little to no attic with vaulted ceilings, etc) - which also means its expensive.

So instead, people go with wifi. It's cheap, no need for a dedicated wiring/network termination panel and/or closet, and can be taken down and taken with you if/when you move.

Personally, I prefer a wired system; when I moved into my house I installed a few drops myself where I knew there'd be some dedicated hardware (TV area, my office, library, and my shop); the other rooms I never installed anything because it didn't matter. For those, the wifi I have fills in those blanks adequately. I ran all the lines back to a custom wiring closet I built in my shop, and terminate everything there (plus a few of my servers live there too).

This sounds plausible to me. Here in Omaha, when I lived in an apartment and there were 30+ APs visible I had to be careful to pick the frequency based on what worked and what didn't, and when I did get it to be reliable I had short range. I am pretty sure this was just because of noise and cross-talk.

Now in a house I see maybe 10 APs and they are all at the edge of their range and I rarely need to tinker with it and it works all the way across the street.