Comfort and Convenience
Seating position is a personal preference: some people like sitting upright and close to the wheel, others further back with arms extended. The same arrangement rarely suits two drivers equally, which is why it varies.
Safety and Driver Assistance
Establishing where the wiper, lighting and demister controls sit is best done while parked. A long route often brings changes in weather or daylight, and searching for an unfamiliar switch takes attention away from driving.
Multimedia and Connectivity
Charging a phone is a separate matter from calls or music. A route followed on screen drains a battery steadily, so a usable power source matters even when audio is handled some other way.