Comfort and Convenience
Preferred cabin temperature varies more than people expect. One occupant drives best with cool air moving, while another finds the same setting chilly, and clothing, build and time of day all shift where the agreeable point sits.
Safety and Driver Assistance
Before setting off, it is worth locating the hazard switch, the demisters and the horn while still stationary. Preparation of that kind removes the need to search for something at the moment it is actually wanted.
Multimedia and Connectivity
Keeping a phone charged is its own need, distinct from calls or music. On a longer route with navigation running throughout, whether the battery lasts to the destination often matters more than anything else on board.