Comfort and Convenience
Preferred driving position is personal. Height, leg length and the angle at which someone likes to hold the wheel all differ, so a setting that suits one regular driver can feel wrong to the next person taking the same errands.
Safety and Driver Assistance
A minute before setting off is the cheap moment to sort mirrors, seat and the hazard switch. Doing it stationary means that later, in moving traffic, nothing needs finding by touch while a junction is approaching.
Multimedia and Connectivity
Errands chain together, and a phone used for lists, parking payments and directions drains as they go. Where a charging point is available, using it on the move means arriving at the last stop with power still left.