Comfort and Convenience
People differ on cabin brightness when they return books: one occupant may want more light to check due dates, and another may want less glare on a phone screen. Neither preference is the default for everyone.
Safety and Driver Assistance
A parked minute spent on the gear selector and parking brake prepares a driver for a bakery-then-bank circuit, where those same controls come up at every kerb stop. Those pauses happen several times on that kind of outing.
Multimedia and Connectivity
When a courier rings during a hardware-store stop, the practical need is to take that call without mixing it with music or charging; if in-car calling is present, it can be used only for the conversation.