Comfort and Convenience
Cabin temperature is the classic disagreement: someone sitting in direct sun and someone in shade rarely want the same setting. Agreeing a compromise at the start saves a journey of silent, competing adjustments.
Safety and Driver Assistance
A minute spent before setting off locating the wipers, lights and hazard switch is a minute well used. Anything found while stationary does not have to be hunted for later with passengers talking beside you.
Multimedia and Connectivity
Battery level is the usual passenger worry on longer runs. Where a charging point is within reach of the seats, whoever is handling directions can keep their phone alive without borrowing the driver's.