Comfort and Convenience
Cabin temperature is a common point of disagreement, because people differ in build, clothing and how much air movement they like. Agreeing on a setting early, rather than adjusting silently back and forth, keeps the journey civil.
Safety and Driver Assistance
Learning where the essential controls sit while parked means less searching later, particularly for lights, wipers and demisting. Passengers benefit too, since a driver who is not hunting for a switch can keep talking normally.
Multimedia and Connectivity
Phone battery is the usual worry on a long day out. If a charging point is available and reachable from the passenger seats, one cable can be shared; where it is not, a power bank covers the gap.