There’s a demand aspect; you generally have to produce a version per market. ~No EU-spec cars would be saleable in the US, as they wouldn’t meet safety standard

There’s a demand aspect; you generally have to produce a version per market. ~No EU-spec cars would be saleable in the US, as they wouldn’t meet safety standards (for instance, very different rules on lights) and vice versa. These standards can often seem trivial, but having two versions of a car is expensive. So “doesn’t meet safety standards” usually means “it is not worth anyone’s time to produce a local version, either for demand or tariff barrier reasons”.