Earlier quoted context omitted.
> The first, and most obvious, reason is that getting your phone and (all) your appliances on the same network is non-trivial. What other networks do homes have? Every WiFi ISP router I have used provides a single network and DHCP server. Perhaps some routers provide both a public and private WiFi and the consumer doesn't understand which one they should pick but that is the fault of the ISP. > Sometimes the washing…
Many cases I knew, people would have several repeaters and extra routers to extend coverage in big houses, and not set it up correctly in PA/Bridge mode, so peripheral network devices would be locked behind in a separate NAT’ed subnet.
[1] Not something we'd /normally/ do, but when that was going on... You just had to get people working.