Whatever the GP meant, it's really a shame that we get 60Hz AC, convert it to DC, just to convert it back to 60Hz AC, and send it down the line where it'll get converted to DC again, just to be converted to 120kHz AC and to DC another time.

Just pushing that intermediate 60Hz AC into 120kHz would already bring a huge benefit. But we should be looking at ways to bypass that first conversion entirely, and increasing the size / reducing the number of those second to last AC to DC converters at a minimum.