Comfort and Convenience
Preferred cabin temperature is a good example: some people travel comfortably in a cool draught of air, while others find the same setting chilly. Clothing, height and time of day all shift the preference.
Safety and Driver Assistance
Spending a few minutes with the lights, wipers, mirrors and hazard switch before departure means you are not searching for them later. Familiarity is simply part of sensible preparation, like checking tyres.
Multimedia and Connectivity
Keeping a phone charged matters most on long days, since navigation and messages drain a battery steadily. If a suitable power outlet or cable is available, a spare lead is still worth packing.