Comfort and Convenience
Seating position is personal: height, leg length and driving posture differ, so a setting that suits one person can feel wrong to another sharing the same car.
Safety and Driver Assistance
Spending a minute with the controls before setting off is worth it in an unfamiliar car. Knowing where the lights, wipers and hazard switch sit saves searching for them later.
Multimedia and Connectivity
Keeping a phone charged on a long drive is a separate question from playing music or taking calls through the car; each depends on which sockets and functions are available.