Comfort and Convenience
Preferred cabin temperature is rarely the same for everyone on board: body size, clothing and where someone sits all change how warm a seat feels, so an agreed setting usually beats a personal one.
Safety and Driver Assistance
Spending a few minutes with the basic controls before setting off, lights, wipers, mirrors and demisting among them, means less searching once the road demands attention. Passengers also benefit from knowing where door handles and belts sit.
Multimedia and Connectivity
Keeping a phone charged over a long trip is its own need, separate from playing music or taking calls. Where a charging option is available, agreeing early who uses it avoids a flat battery on arrival.