Comfort and Convenience
How much cabin quiet people want on a long trip varies: one occupant may like conversation, while another prefers a calmer space to think, so the same journey can feel different to each person.
Safety and Driver Assistance
Before leaving, it helps to know where the lights, wipers, and demister are, so a change in weather during the trip does not turn into a hunt for switches.
Multimedia and Connectivity
A passenger may want to take a call during a long stretch. If call audio can be used in the cabin, that need stays separate from playing music, and charging a phone is a further, distinct task.