Comfort and Convenience
Preferred seating position varies from person to person: height, arm length and how far someone likes to sit from the wheel all differ, so a setting that suits one driver rarely suits the next.
Safety and Driver Assistance
It helps to locate the hazard switch, lights, wipers and mirror adjustment while still parked. Finding them in advance means the first time they are needed is not also the first time they are looked for.
Multimedia and Connectivity
Navigation and music drain a phone battery over a long drive, so keeping the handset charged matters in its own right, separately from whether calls are taken through the car or audio played from it.