Comfort and Convenience
Cabin temperature is a common point of negotiation, because people vary in build, clothing and how directly air reaches them. A setting that suits one traveller can feel too cool a seat away.
Safety and Driver Assistance
Learning where the lights, wipers and hazard switch sit before setting off means those actions need no searching later. Passengers also benefit when the driver's attention stays on the road rather than on unfamiliar switchgear.
Multimedia and Connectivity
Keeping a phone charged on a longer trip is a practical concern, since navigation and messaging drain a battery. If a suitable power outlet or cable is available, agreeing who uses it avoids small disputes.