Comfort and Convenience
Preferred cabin temperature is a clear example: passengers rarely agree, and a setting one person calls pleasant another calls too warm. Clothing, seating position and the time of day all shift that judgement, so the choice stays personal.
Safety and Driver Assistance
Spending a few minutes with wipers, lights and mirror adjustment while parked means those functions are already known by the time they are wanted. Preparation is simplest before setting off, when nothing else is competing for attention.
Multimedia and Connectivity
Keeping a phone charged across a long drive is a need of its own, separate from making calls or playing music. Where a suitable power source and cable are to hand, the battery lasts the whole journey.