Comfort and Convenience
Fresh air is a good example: some people prefer a window open on short local runs, others keep the cabin closed. The preference follows habit, the weather someone is used to, and how sensitive they are to outside smells.
Safety and Driver Assistance
Learning where things sit is easiest while parked. A few minutes spent working out the wiper stalk, the demister and the hazard switch means the first sudden shower or fogged screen is not also a first lesson.
Multimedia and Connectivity
Phone battery is the usual concern: a charging point matters across a long chain of errands, while calls and music are separate questions. If a hands-free function is available, setting it up before leaving is sensible.