Comfort and Convenience
How warm the cabin feels is a common everyday preference, and it differs because occupants do not share the same idea of a comfortable temperature on a given day. A passenger in a coat may want less heat than the driver.
Safety and Driver Assistance
Taking a moment to locate the hazard switch and the horn before setting off is useful preparation, because those controls are needed suddenly rather than as part of a planned routine.
Multimedia and Connectivity
Hearing spoken directions on an unfamiliar route is a common need. If cabin audio can play that guidance, it may help; otherwise the phone is listened to on its own.