Comfort and Convenience
Seating height is a common example. Some people prefer sitting high with a clear view over the bonnet, others sit lower and closer to the wheel, and body proportions and driving habits differ enough that one setting rarely suits two drivers.
Safety and Driver Assistance
Finding the wiper, lighting, demisting and hazard controls while still parked takes only a moment. Unfamiliar switchgear is easiest to learn without traffic around, and that short routine also shows which settings a previous driver left changed.
Multimedia and Connectivity
Phone charging is the plainest need, since a battery drains faster when navigation runs for hours. If a suitable power socket or port is present, keeping a matching cable in the car is what makes it useful.