.... Many older homes don't have a neutral wire hidden in the back of the junction box....
And many newer homes built just a few years ago..... have multiple CAT5 and phone connectors in each room. I ran CAT5 and Phone in my home... at some expense and
great effort. I also ran concealed speaker wires (and speakers) as well. Who knew (20 years ago) that WiFi and Bluetooth would be what it is today.
I am now charging my iPhone "wirelessly"..... and
I don't even know how that technology works! One of the great challenges and real beauty's of Home Automation is solving problems and finding solutions. That is what brings a LOT of people to HA. Whether it's to control a light from a remote location, or see an area using a camera,
HA solves home design problems. Maybe we haven't [collectively] solved the "no neutral wire" problem yet.... but I am sure there are solutions out there... waiting to be found.