Comfort and Convenience
On a short hop to the shops, one occupant may want a cooler cabin while another wants more warmth, because temperature preference is personal rather than shared.
Safety and Driver Assistance
Taking a moment in the driveway to find the horn, indicators and hazard switch means those actions are already known if they are needed on the first junction.
Multimedia and Connectivity
If a radio or media player is available, listening during a slow queue is mainly about starting or changing the programme without leaving the driving task.