Comfort and Convenience
During a wait outside school, some occupants like a window cracked for fresh air, while others prefer it shut; both are ordinary personal choices.
Safety and Driver Assistance
Before a shared trip, the next driver can sit parked and learn the indicators, horn, and window switches so those actions are already familiar once the car is moving.
Multimedia and Connectivity
If a work call comes in during a lunch break, it may only need a clear way to speak and hear; music playback, if wanted later, is a separate choice.