Comfort and Convenience
Seating preferences vary because body proportions and driving posture differ, so a position that suits a taller driver can leave someone shorter reaching. Most people work out what suits them within the first few journeys.
Safety and Driver Assistance
Spending a few minutes with the controls before setting off means lights, wipers and mirrors are found by habit rather than searched for while the road is asking for attention.
Multimedia and Connectivity
Keeping a phone charged on a long trip is a separate need from playing music or taking calls. Where charging is provided, it usually works independently of whichever audio source happens to be in use.