Comfort and Convenience
Preferred cabin temperature varies widely. One person warms up slowly on a cold morning and wants heat straight away; another finds the same air stifling within minutes. Clothing and tolerance for warmth simply differ.
Safety and Driver Assistance
Preparation is easiest while stationary. Mirrors, seating and the route itself are all better sorted in the driveway than at a junction, especially in an unfamiliar or recently borrowed car.
Multimedia and Connectivity
Hands-free calling is a common need on errand runs, when a message about a pickup or a shopping list arrives mid-journey. Where such a function exists, setting it up once beforehand saves fiddling later.