Comfort and Convenience
Seating preferences differ because bodies do: height, leg length and habitual posture all change where someone wants the seat and steering wheel to sit. Two people sharing one car often settle on noticeably different positions.
Safety and Driver Assistance
Locating the essential controls before moving off means less searching later, when rain starts or a junction arrives sooner than expected. A short pause while parked is usually enough to find lights, wipers and the demister.