Comfort and Convenience
Temperature is the comfort question that divides people fastest: one passenger feels a draught while another asks for more air. Agreeing on a setting early, rather than adjusting it repeatedly, usually keeps everyone reasonably content.
Safety and Driver Assistance
A few minutes spent locating lights, wipers, mirrors and the hazard switch before setting off means none of them is being hunted for later, with passengers talking and the road demanding attention.
Multimedia and Connectivity
Phone battery is the common worry on longer trips. If a charging point is available and reachable from the passenger seats, a phone used for navigation or messages can stay topped up without being passed around.