Comfort and Convenience
Preferred cabin warmth differs between people, because they notice heat differently and the same setting can seem mild to one occupant and too cool to another.
Safety and Driver Assistance
Locating the hazard switch and horn while the car is still on the driveway turns later use into a known habit rather than a search in a queue.
Multimedia and Connectivity
A day of appointments often creates a need to keep a phone charged, and a cabin socket, if fitted, is there for that top-up rather than for calls or music.