Comfort and Convenience
Cabin temperature is a good example: one person's pleasant warmth is another's stuffiness, and preferences shift with clothing, time of day and how long someone has been sitting still. Agreeing a setting early avoids quiet disagreement later.
Safety and Driver Assistance
Before setting off, it is worth locating the essentials, among them lights, wipers, demisting and the hazard switch, while the car is stationary. Rain or dusk is a poor moment to start searching.
Multimedia and Connectivity
Keeping a phone charged is its own concern, separate from playing music or taking calls. If navigation runs for hours, a working power supply and a suitable cable are worth packing rather than assumed.