Comfort and Convenience
Cabin temperature shows how personal comfort really is. Clothing, build and plain habit mean two people in the same car often want different settings, so being able to adjust them without a negotiation tends to be valued.
Safety and Driver Assistance
A couple of minutes before setting off is a sensible time to locate the essentials: lights, wipers, demist, hazard switch. Preparation of that kind costs little, and it is easier done while parked than under way.
Multimedia and Connectivity
Taking a call on the move is the most common phone need in a car. Where hands-free calling is supported, the practical meaning is simple: the conversation runs through the car rather than a handset held in the hand.