The market for stand alone head units has completely collapsed in the US. This largely comes down to head units in newer cars being tightly integrated with the

The market for stand alone head units has completely collapsed in the US. This largely comes down to head units in newer cars being tightly integrated with the rest of the vehicle (particularly using non-standard form factors for mounting into the dashboard) and the stock units being "good enough" unless you are deeply into car modding. It would surprise me if even 1% of cars made after the year 2000 (which was 20 years ago, and probably the oldest vehicles anyone would daily drive, at least where I am in the rust belt) had an aftermarket unit installed. From that perspective the age of the head unit is (almost) always equal to the age of the vehicle, with CarPlay and Android Auto not being released until after reverse cameras had already been mandated in new vehicles.