Comfort and Convenience
Cabin temperature is a good example: the setting one person finds pleasant can feel stuffy or chilly to someone beside them, because perceptions differ with clothing, activity beforehand and simple individual sensitivity.
Safety and Driver Assistance
Spending a moment with the basic controls before setting off, among them lights, wipers, mirrors and the hazard switch, means less searching later, when attention is already divided between the road and the people aboard.
Multimedia and Connectivity
Keeping a phone charged on a longer trip is its own need, separate from calls or music. Where a suitable power outlet or cable is available, passengers can top up without passing one device around.