Usually the critical features are somewhat "air-gapped". For example, I can restart my Model X computer, the screen will turn black 100%, and many key functions

Usually the critical features are somewhat "air-gapped". For example, I can restart my Model X computer, the screen will turn black 100%, and many key functions still work. None of the computers that are required to drive the car actually turn off when you reboot the computer that drives the dash/console display.