I bet that 50Hz Unimatic would dry even faster if run on a 240 volt 60Hz supply.
I wish the US would had gone to 220 volts at some point. If not 60Hz, 50Hz would have worked too but as long as it was somewhere between 220-240 volts. Preferably derived via two hot conductors but thats just me.
220-240 volts would have allowed for high powered heaters in front load washers and dishwashers making for faster, more efficient front load washers. Including the possibility of cold only hook ups. Appliances like dryers, stoves and ranges would be simpler by not having 120 volt components. And of course none of that grounding through the neutral stuff would ever have been likely.
FWIW, this is how I imagine an electrical panel in the US if everything was all 240 volts. 20 glorious double pole breakers
(Click to enlarge the pic)