> removing a protective coating, which is why Americans refrigerate eggs.
The egg thing is oft repeated, but not actually true. The coating is not magic, it's just oil, and America does wash the eggs, and then applies some oil. I have not refrigerated my eggs in the US in decades with no problems at all.
> The motivation in the US was avoiding salmonella, but other places have avoided that by improving cleanliness practices of the farms rather than washing their eggs.
This isn't true either. Other places avoid salmonella by immunizing their chickens. It's not required in the US (mainly because since the US refrigerates its eggs, immunization doesn't help much), but more and more farms are immunizing chickens, eventually the reason for refrigerating eggs will vanish - but I'm sure they'll still require it. (The circular relationship between these two things is not lost on me.)
Farmers in the UK value cleanliness not because of Salmonella but because dirty farms make for dirty eggs as seen by the consumer, since they aren't allowed to clean them.