Ok, I would assume this is something that might differ between countries. Here in Scandinavia I've met extremely few people running their desktops exclusively on WiFi since it's generally unreliable when having lot of devices talking to same AP/WiFi router in a noisy environment with lot of other networks taking up same frequencies. Actually, I would say running Powerline to desktops is more of a standard approach here.
Uhh.. Hi, I'm a Scandinavian (Swede). I got a desktop exclusively on WiFi. I've never seen an office or a home actually use "powerline" (Network over electricity network).. Oh well, one anecdata against another anecdata :-)
Powerline networks are mainly utilized by people living in concrete multi-story houses that either do not wish to install a proper Ethernet backbone to all rooms or take a gamble with WiFi due to higher cost, thickness of walls or other reasons that might seriously affect connectivity as mentioned before.
I used to run my own IT support company with several employees (think Geek Squad) having both enterprise customers aswell as private sector and people running Powerline is actually a lot more common than you might think (my parents for instance are running it along with WiFi in their house - deskop, IPTV and camera surveillance is on Powerline while tablets and phones are on WiFi).
During all my years in IT I've encountered two situations which I can remember where WiFi was used on a desktop machine instead of Ethernet or Powerline - one was a car dealership where they had a salesman sitting in a "glass box" and they were sharing building with another company (so, no Powerline) and other situation was a enthusiast that built himself a new computer and his new Asus motherboard came with 802.11n built-in..
Personally, I am running all my desktop machines on a 10Gbit CAT6a network I have at home (I do have a WiFi as well but it is on another VLAN with no access to network infrastructure - mainly used by kids) where I have possibility to stream multiple 4K streams from my FreeNAS server while downloading huge files of the Internet without even breaking a sweat - try to do that over a WiFi connection and you'll hit into a brick wall pretty fast.
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.
Happens all the time. Lots of people in apartments/houses who don't want an RJ45 running through the hallway nor do they want to pay for RJ45 wiring (particularly when renting).
Interestingly, in the last 10 years I've not met anyone who bothers with RJ45 in the home. Everyone in the UK gets a free wifi router with their broadband, and tends to just use that.
Not saying you are wrong, just different areas are different.
My parents live in a 200-year-old house with Cat6 ethernet in the walls. They needed to replace the electrical wiring, and decided to get it installed at the same time. I don't think they've regretted it, especially as thick walls attenuate the wifi signal. I'm pretty sure this is unusual, though.
More broadly, I think home desktops are getting rarer in the UK. Wifi is the obvious answer for portable devices with wifi capabilities built in, even in dense housing with lots of devices interfering with each other.
That definitely is unusual, but when you're doing a whole-house electric refurb (given what little you mention, it sounds like a tube-and-knob switchout, right?), you likely have everything torn up to hell and back, so you might as well fix or add anything else behind the walls while you can.
People do. One of my friends asked for a "USB to USB" cable last week. (you have how many phones but no USB cables?) Turns out that he wanted to connect the USB type A port on a WD My Cloud (NAS?) directly to his desktop, because connecting the drive via ethernet to the router and transferring over wifi from his basement desktop estimated that it would take 2 weeks.
I would say the vast majority of people use wifi for desktop. (Not myself personally except on the third floor of my house). You might be surprised by the percentages.
also don't underestimate the power of stealing your neighbor's internet. I have a fun little router that's named "dontstealmyinternet". I kept the router's default passwords but have it blocked. It gets about 5 attempts a month from new machines.
My < 6 month old, $4500 USD desktop has 2 x 1 GbE plus 10/100 BMC, but I put an Intel 7265 PCIe card in it and use that instead.
I do use one of the Ethernet ports but it just goes to another router next to my desk (connected via crappy Powerline to the rest of my network) for testing w/ KVM.
Consumer machines have WiFi pretty standard now, my desktop has WiFi. It came that way from the manufacturer. Not everyone wants to rewire their house to where they want their computer.
