Comfort and Convenience
Cabin temperature divides people more than almost anything else. One passenger wants air moving constantly, another finds a draught unpleasant, and on short errand runs there is little time for a compromise to settle.
Safety and Driver Assistance
Preparation costs little. Checking the mirrors and locating the main switches while still parked means fewer distractions once the car is moving, which is worth doing whenever a layout is unfamiliar.
Multimedia and Connectivity
Hands-free calling is the everyday need for anyone rearranging a pickup mid-route. Where the system supports it, taking the call through the car keeps the handset out of the driver's hands; music can wait.