Comfort and Convenience
Cabin temperature is a personal matter: some people want warm air early in a trip, others prefer it cool and moving. Clothing, the time of day and simple habit all pull the setting in different directions.
Safety and Driver Assistance
Anything that can be set while stationary, seat and mirror position among them, is easier to handle there than in a moving queue. Locating a switch or menu once has the same value.
Multimedia and Connectivity
Calls in town raise a separate question from music: they need a handling method chosen in advance, since a ringing phone is a poor moment for decisions. If hands-free operation is present, it serves that purpose.