Comfort and Convenience
Cabin temperature is a common point of difference: one person's comfortable warmth is another's stuffiness, because body size, clothing and where someone sits relative to the vents all change how the same air feels.
Safety and Driver Assistance
Spending a few minutes with the basic controls before setting off, such as lights, wipers, mirrors and demisting, means less searching later, so attention can stay on the road rather than on unfamiliar switches while passengers are talking.
Multimedia and Connectivity
Passengers often arrive with low batteries, so it helps to agree in advance who plugs in where; if charging points are available, keeping a suitable cable to hand saves rummaging mid-journey.