I own an eight years old electric vehicle. It’s not connected to the internet anymore, and it is fine. The maintenance is done by professionals. Sometimes they do software updates.

I also own a new electric vehicle connected to the internet that updates itself once in a while. I know various non-official garages in my area that can fix it when it’s out of warranty. I guess if I remove the modem, it will simply stop updating automatically, and I will lose a few features like the smartphone app, like my other car.