Comfort and Convenience
Seating comfort is largely a matter of proportions and habit: drivers differ in leg length, torso height and how upright they prefer to sit. A position that suits one person can feel cramped or distant to another.
Safety and Driver Assistance
Knowing where the lights, wipers and mirror adjusters sit before setting off means less searching later. Learning this while parked is simply easier than working it out with traffic around you.
Multimedia and Connectivity
A phone can be needed for three separate things: keeping its battery topped up, taking calls, and playing audio. Where a socket or connection supports only some of these, the rest still need their own arrangement.