Comfort and Convenience
Seating position is personal: height, reach and preferred posture vary, so a setting that suits one driver feels wrong to the next. Anyone sharing a car is wise to settle in rather than drive off as found.
Safety and Driver Assistance
The few minutes before setting off are the calm time to locate hazard lights, demisting and wipers. Learning these while stationary keeps later attention on the route rather than on hunting for a switch.
Multimedia and Connectivity
Keeping a phone charged on longer trips is a common need, and where a suitable socket or cable is available it removes the worry of arriving with a flat battery.