240 in the neighborhood - i.e., that’s enough to distribute from the pole to a few houses. Of course you have higher voltages to go longer distances. This is equally true for AC vs DC. Thus, the idea that it takes a looot of copper for DC is erroneous.

In fact, where conductor size is relevant is that you can use smaller conductors for DC, because of the skin effect.

Wiring: Split phase, that is also usable as 240 for large appliances. So, the latter.

I mean, you need a lot of voltage to make voltage drop irrelevant. Like, 120 or 240 volts. If distribution is voltage is the same dc/ac, we could use the same wiring (but different breakers, and everything else).

So the wiring argument doesn’t really hold up - the question is more about efficient converters to reduce voltage once it’s at the house.

I.e., for typical American distribution, it’s 240 in the neighborhood and drops to 120 in the house. If the dc does the same, the same amount of power can be drawn along existing wires.