That field is here to allow the support of it, not to make it required everywhere.

Seatbelts isn't required everywhere, but car maker won't make two version of a car, one that support seatbelts, and one that doesn't. They will make one model, with the required attach points to install a seatbelt, and install an actual seatbelt only on cars that goes somewhere where it is mandatory.

Here we are in a similar situation. That filed is here to make of possible for OS to support that law, but it doesn't mean we'll all have to conform to that law unless you live in a country that have said law.

The largest state in the union that has a GDP larger than many countries.