> But how many other applications need >2000W of power delivery that 220V would allow?

Tea kettles, space heaters, some power tools (e.g. I've got an electric power washer that uses like 14A, and it was too weak to run an attachment I'd hoped to use with it.).

Also, I think countries that have 220V at the wall have access to 440V for when Americans would use 240V, so they can have even faster EV chargers, etc.