USA electrical system is different, it is roughly half the voltage of UK system, so for a given Wattage, it is roughly double the Amps.
Energy lost in a cable is to the square of the Amps, so for a given cable temperature you need to square the cross-section, so double the thickness.
So a mains cable in USA has to be twice as thick, four times heavier, than a UK cable.
Those USA thicker cables are harder to bend around, loop, tidy so there’s more downside to excess cable in extensions.
But you know the biggest problem? You have to wait twice as long to boil the kettle. Don’t even get me started on making toast.
The advantage of the US system is they do a 2-pin variant, the UK never did (apart from “shaver plugs” which are the Europe style 2 pin). That means you get Anker folding pins wonderfulness. And you get the 2-cord 2-pin where you can 3 electrical outlets in a space UK can struggle to fit 2. The lower voltage, which doubles the diameter of cables, also means you can keep the “brown” and “blue” wires nearer, as lower voltage is less able to arc spark jump so you don’t need the UK longer earthed pin to reduce arcing.
I think overall I prefer the USA electrical system, it works out on average smaller to travel with, but it does mean these USA earthed 3 cores extension systems tend to end up shorter than the UK earthed 3 cores equivalent.
Everything has a reason!