Comfort and Convenience
Seating position is a personal preference: height, reach and how upright someone sits depend on build and habit rather than one correct setting. Two people sharing a car often want noticeably different arrangements.
Safety and Driver Assistance
Learning where the essentials live — hazard lights, demisting, headlight settings — is best done while parked. Preparation of that kind leaves fewer unfamiliar actions to work out once the journey is already under way.
Multimedia and Connectivity
A phone running navigation for hours loses charge steadily, so charging is worth planning as its own question. Handling calls without holding the phone is a separate matter again, and music another.