This is missing the point, I think. The point is not to be disconnected entirely, it’s to have control over that connection. While driving, one can turn off their phone, run a fully open-source device, old-school GPS, or whatever. But cars don’t give much if any control over the software they’re running or their broader connectivity. They’re oft becoming highly-integrated proprietary devices.
Maybe, but in the most paranoid case it’s a lot more practical and straightforward to put a small device in a faraday cage or remove the battery than doing so for the car being actively driven.
