They are not that separated. Some modern cars have the entertainment system take note of the speed of the engine and adjust the volume accordingly. Some flip the infotainment display to a backup camera when the transmission is indicated to be in reverse.

This is in addition to some cars adjusting the side mirrors when in reverse. I remember reading of an exploit that took advantage of the fact that the security system was on the same network in a particular car and thieves were able to crack off a side mirror and inject an "unlock" command. Does anybody have a reference for that?