Comfort and Convenience
Cabin temperature is a common point of difference: what feels pleasant to a driver may feel cool or stuffy to someone seated behind. People vary in clothing, activity and sensitivity, so agreeing on a setting helps.
Safety and Driver Assistance
Knowing where the lights, wipers and demisting controls sit before setting off means attention stays on the road rather than on searching. Familiarity of this kind is simply preparation, and it is easiest to build while parked.
Multimedia and Connectivity
Passengers often arrive with a low battery, so charging matters on longer trips. Where a power source is available, it keeps a phone usable for the whole journey instead of only the first part of it.