Earlier quoted context omitted.
Again, all of those lower the value to the thieves. If they need to create a custom engine controller, they’re going to need to pay a lot more than the $0 they currently spend. If they need to replace the entertainment system, the cost of doing so will cut into their margin. Don’t make the mistake of thinking that a system needs to be perfect to be worthwhile.
I think you're in a desktop computer "whole product is one computer" moddel. A car is a set of computers, almost nothing in a car is central to itself. There's probably a body controller ECU that ties into engine ECU and driver's key systems. So theives would just generate and flash a new key/cert, that'll be certainly possible. Infotainment? That's almost literally an aftermarket parts. American reviewers tend to se…
This sounds like the old desktop mentality you mentioned. You can’t just reflash things to bypass a secure boot process – the entire point is to prevent things like that! You’d design the driver’s key to pair with the various onboard systems and those systems to do a challenge-response cycle during the boot process so someone can’t easily drive away without the key or resell those parts, with both sides using a private key which never leaves that component. Yes, that kind of design can still be attacked but the goal here is to make it more expensive than it’s worth: needing a flatbed to take it somewhere for a rogue EE to work on it, for example, just isn’t going to make sense except for the most expensive luxury vehicles.
This brings me to:
> Infotainment? That's almost literally an aftermarket parts.
Yes, and those cost money. The entire point is that you don’t need to make it perfect, just expensive. If someone has to replace the display and speakers, that means they’re making less profit on the sale and making it more obvious that the vehicle was stolen which increases risk and reduces the number of buyers, especially for the most valuable vehicles.