Comfort and Convenience
Seating preferences differ because people vary in height and leg length. A position that suits one driver can leave another reaching for the pedals or sitting closer to the wheel than they would like.
Safety and Driver Assistance
Knowing where the lights, wipers and mirror controls sit before setting off means those actions come from memory later, instead of from searching the cabin while traffic is moving around you.
Multimedia and Connectivity
Charging and audio playback are separate needs: a socket that keeps a battery topped up does not by itself carry sound, so it is worth knowing which functions a given port supports.