Comfort and Convenience
Cabin temperature is a good example: some travellers prefer cooler air throughout, others warmer. Perception of warmth varies with clothing, activity and where someone sits, so passengers sharing one cabin rarely agree on a single setting.
Safety and Driver Assistance
Time spent learning where the lights, wipers and hazard switch sit is better spent before departure than during the drive. Familiarity means a routine action stays routine, instead of becoming a search across an unfamiliar dashboard.
Multimedia and Connectivity
Phone battery is the usual constraint on a long drive, since navigation drains it quickly. If a charging option is available on board, keeping a suitable cable to hand turns that possibility into something usable.