Come to think of past wattage and amperage draw,
After WW2, an Elux XXX was rated at 500 watts. Back in the 1960's, most vacuums were rated at about 6 or 7 amps.
I suppose with dense Saxony 25 ounce carpet, you need 12 amps?
Then, motors lost a fan for canister's in the 80's. A twin fan that drew 9 amps cleaned as well as a single fan motor that draws 12 amps.
Todays flooring fashions are less carpet, and more tile, slate, marble, granite, or wood, with area rugs here and there.
Miele claims that a vacuum which has automatic power monitoring using pressure transducers saves almost 50% electricity over it's life as one without.
It makes little difference to the individual consumer in their monthly bill, but multiplied by millions of homes, the conservation of energy is significant.
Scientists have done the math. Engineers have designed the solutions.
EU standards aside, we have populated the planet to nearly 8 billion.
Call a friggin tree hugger, lefty Lib, or whatever, I don't care.