It might also be the choice of how they choose to integrate it. In some Nissan cars the Bluetooth is a canbus device that you have to pair through weird gyrati

It might also be the choice of how they choose to integrate it. In some Nissan cars the Bluetooth is a canbus device that you have to pair through weird gyrations on the steering wheel unless you have a Satnav unit. I mean it works fine in my experience but it's weird as hell. My guess is that they're buying canbus modules from some supplier like Bosch and just slapping them on the canbus so they can check a box on the spec sheet.