We agree... well, at least I agree...
This is true for about any insurance company of any type insurance. It all differs per country.
I mean if I was to move to another country for the corporation where I work, our other countries have different benefits and use different insurance providers. (I'm talking health insurance here).
Another example is that a LOT of US auto insurance policies don't cover your vehicle into Mexico. You have to purchase a separate "rider" policy.
This is all based on the "underwriter" of the insurance company and how they do business. It's fairly typical.