Comfort and Convenience
Cabin temperature is a good example: some travellers feel comfortable several degrees cooler than their passengers. Body size, clothing and how long someone has been sitting all shift that preference, so agreement on a setting usually takes negotiation.
Safety and Driver Assistance
Learning where the wiper, light and demister controls sit while parked means less searching for them later. A few minutes with the handbook before setting off covers the switches that are rarely needed but awkward to hunt for.
Multimedia and Connectivity
Keeping a phone charged matters most when it doubles as the navigation device. Whatever sockets or pads a car offers, carrying the right cable is what actually keeps the battery topped up over a long day.