Comfort and Convenience
Preferred cabin temperature is a good example. Some travellers settle at a cooler setting while others want warmth, and build, clothing and seating position all play a part, so agreeing a compromise early avoids constant adjustment.
Safety and Driver Assistance
Time spent locating wipers, lights and demisting before pulling away means those controls can be found without hunting for them later, when attention belongs on the road and stopping to look is inconvenient.
Multimedia and Connectivity
Battery level matters on a long day, since a phone used for navigation drains quickly. Knowing in advance whether a suitable cable or socket is to hand decides how much charging can happen underway.