Comfort and Convenience
Seating position is the clearest example: a tall driver and a short one rarely settle on the same relationship between pedals, wheel and seat, because comfort depends on body proportions rather than on any single correct setting.
Safety and Driver Assistance
Spending a few minutes with the basic controls while parked is simply sensible preparation. Learning where the lights, demister and hazard switch sit removes one small task from the list of things happening at once later.
Multimedia and Connectivity
Keeping a phone charged on the move is its own separate need from playing music or taking calls. If charging is possible, a long drive no longer depends on the battery level you set off with.