Comfort and Convenience
Seating position is a personal preference: height, reach and posture differ from one driver to the next, so the setup one person settles into can feel wrong to whoever takes the wheel next.
Safety and Driver Assistance
Preparation is simpler when stationary. Locating the hazard lights, demister and mirror adjustment before setting off means those things have already been found once, rather than being looked for mid-journey.
Multimedia and Connectivity
Phone battery is the everyday concern, since a morning of navigation drains it quickly. Where a car offers a charging point, the practical meaning is simply arriving with enough charge left to use afterwards.