I don't think anyone was disputing this. I think the majority of us don't have a fixed place PC or a server at home. Perhaps not on an overclocking forum, but in general
Remember I am talking about running Ethernet through the house to dedicated wall sockets - not just connecting a 1 metre cat 5 cable from a PC to a router.
It doesn’t matter if your fixed device is an X-box, PlayStation, Sky box, IP TV, multi-room speaker - whatever - it should be wired in. A current wireless access point (802.11AX is different) only talks to one client at a time. So every time you add a wireless device it literally doubles the access time/halves the data rate to everything else. And everything is constantly chatty because the access point has to keep in touch with all potential clients.
Looking at my living room, I have a TV, Sky box, IP TV box, games console, 6 Sonos speakers and a blue-ray player all cabled into the network. All of that could be on the WLAN but imagine the wireless traffic if I was watching a movie. And streaming high quality video over WLAN from a media server is every bit as bad as heavy file transfers.
Running Ethernet to sockets throughout your home is without a doubt one of the best things you can do if for no other reason than it cleans up the airwaves for devices that don’t have a LAN port.