content: Stupidity. That's it. There are some interesting, smart features. Having the radio decreasing the volume when slowed down is a nice feature, doesn't have to be as loud when there will be less road noise.    New features mean fancier sticker price. The problem is that none of this seem to be every verified to work correctly. The authors of this attack have already stated that the manufacture ignored their previous work, ignoring problems for more than a year.  It doesn't have to be air-gapped, it just has to be properly isolated. Placing everything on one wire, with no verification, with no documents, that is nothing isolated. I will not attempt to point out a silver bullet solution that would fix this, it's fire everyone and try again. There will not be "simple as air-gap" solution that would fix it. when not even one part of the system was secure, there isn't one place that isn't wrong.