In Spain they soon will require V-16 [0] too. Originally it was just a light but then it was improved to use mobile networks to send an emergency call to authorities. And proving, that technically, it is possible to have something like ECall but without deep integration into the car.

No need of having always on connection to the network, only enable on emergencies. No remote hacking of SIM/base band possible at random times. Mechanic or user can check battery periodically, replace if low, just like wiper fluid. Car could even cut all electric systems after deploying the integrated V-16 system.

Car manufacturers deciding to make their ECall implementations complex and privacy invading was their choice.

[0] https://en.wikipedia.org/wiki/V16_warning_beacon_lights