Perhaps that’s true but USA wiring is 120V /15A per breaker without rewiring so your point isn’t really relevant. Older houses might even be 110V and not have dedicated circuits in the kitchen.

Not sure why you even brought up anywhere that’s not the US when the paper is talking specifically about US kitchens

I'm talking about the possible technology, and isn't US electrical code allows 220V outlets for high power applications like washer/drier sets? Do I have been lied to?

All US homes have 220V at the breaker [1]. That doesnt mean its available anywhere else in the home since the only appliance that is necessarily 220V is AC (dryers, ovens, all come in gas) and the AC is typically hardwired. You also have a lot less versatility in how you use 220 in the US (just look at the size of the NEMA outlets)

[1] Europe was poorer than the US at the turn of the last century and adopted 220 to save on copper. 110, all else equal (and its not) safer. In the US, two phases of 110 come in from the transformer box outside to your box 180 degrees out of phase. Taking both phases, you get 220V.

The Brits, to save even more copper, did something insane - ring circuits

The point is that kitchens don’t have 220V outlets generally. converting costs money, a lot of it. Money better spent fixing industrial issues.

> kitchens don’t have 220V outlets generally

I'm from the US. Every home I've lived in (9) has had at least one or more 240V 30A circuits in the kitchen, my current home has 2 and it was built in the 80s so not exactly a modern build. There usually aren't a lot of outlets, as things like built-in ovens and ranges are often hardwired and not on a plug. Though the stand-alone oven/range units do often have a plug, but you don't normally see it unless you're swapping out units. They'll usually have a NEMA 14-30 or 10-30.

It cost me $400 to have an electrician instal a 220V NEMA plug in my home.

Granted, it was an easy instal - unfinished, small basement giving easy access to the kitchen and 20 feet of 50 A cable.

A one-story house with an unfinished basement makes it sooo easy to do a lot of common home upgrades. I'm jealous, everything around me is just slab-style houses so it can be a pain to do anything like plumbing work without just resorting to having stuff in the attic.