I would like to add a bit more info about this article. Wifi 6 is not going to displace ethernet any time soon. WiFi 6 is at best Gigabit shared across the network and is probably much less depending on how you connect to the backend and how many devices are connected.
Ethernet depending on the cable and the switches can be at least 40 Gbit. Theoretically, fiber is faster but not affordably so for home networks at this time. Although 40 Gigabit ethernet is not exactly affordable either, still it is much faster than a WiFi 6 mesh network. So at least for the backhaul or mesh to internet connection ethernet still makes a lot of sense to avoid eating up the WiFi network speed with back channel traffic. So do not abandon the idea of ethernet and if you are cabling by all means plan on Cat 7/8 just to be on the safe side.