Comfort and Convenience
Cabin temperature suits nobody universally: one person feels a draught where another wants more air moving. Agreeing on settings, or letting people direct vents their own way, is usually how shared journeys get negotiated.
Safety and Driver Assistance
Locating the wipers, lights and demister before setting off is quick preparation that pays back when rain arrives or a window fogs, since searching for a control is a poor use of attention mid-journey.
Multimedia and Connectivity
Keeping a phone charged matters most on longer trips, where navigation drains a battery steadily. Where a suitable socket or charging point is available, a cable kept in the car prevents arriving with nothing left.