It should just be DC all the way, baby
.
Just kidding, the safety issues alone would give me nightmares.
I have 200A, 240VAC single phase in the NE US. Most of my area started at 60A through the 1950s, 100A in the 1960s, and now 200A seems to be the standard, since you need to power those air conditioners. It cost me about $1000 USD to upgrade from 100A to 200A, and this included the cable from the power head to the breaker box, a new, much larger breaker box, and installation.
There are a lot of advantages to 3-phase in industry, but in the US, the rediential single phase system is in place, and the main reason for three phase, motors, is rapidly going away due to the low cost of VFDs. These provide huge advantages to motors (variable speed, all kinds of protection, etc.). And many appliances have already moved to this combination (BLDC is essentially the same system) because of these benefits. My clothes washer, dishwasher, fridge, and AC units all have VFDs of some sort. They can be really, really cheap as part of a custom appliance control system, and they let you use a cheaper motor. I recently replaced a 16 year old clothes washer, and the old one had a VFD, which still worked (the failure was an aluminum bearing strut).
Since the advent of three-phase VFDs, I quit thinking about 3-phase for my house.
John