Comfort and Convenience
Cabin temperature shows how personal comfort is. A setting one occupant finds pleasant can feel too warm or too cool to the person beside them, and the same person's preference shifts with the season.
Safety and Driver Assistance
Before setting off it helps to know where the essentials sit: lights, wipers, the hazard switch. Hunting for one of them is a task better handled while parked than in moving traffic.
Multimedia and Connectivity
A phone running navigation for a long trip loses charge steadily, which is when keeping it powered matters most. Where onboard charging is available, that concern largely disappears from the journey.