Comfort and Convenience
Cabin temperature is a common point of difference: what one person finds pleasant, another calls stuffy or chilly. Build, clothing and where somebody sits relative to the sun all shape that preference.
Safety and Driver Assistance
Taking a minute before setting off to locate the hazard lights, demisting and mirror adjustment means less improvising later. Preparation is easiest while stationary, when a passenger can also be shown the door release.
Multimedia and Connectivity
Battery level is the usual worry on longer trips; where charging is available aboard, a passenger can look after it. Calls are a separate matter again, and music choice is best agreed before departure.