I am not proposing DC for high power devices, though I think it is suitable for low power devices. Most of what I have plugged in in my home are low power devices with power supplies. Higher voltages are required for higher power, and even higher than 120v makes sense was part of my point, with modern tech.

I am not proposing high-frequency for long haul though it might make sense for short-haul (from transformer to house).

For many devices, high-frequency modest voltage would be easy to convert to the power needed. At a minimum you would not need to do the rectify and chop portion of the typical switched mode supply.

Many of the things that make sense in the car can make sense in the home or office.

It would be nice if plug in low power devices would all centralize on a voltage, but we can't seem to get them to do that. But maybe it can happen.