Comfort and Convenience
Temperature preference is a common source of disagreement in any car: one person wants airflow on the face, another finds the same setting chilly. Clothing, time of day and personal metabolism all play a part.
Safety and Driver Assistance
Adjusting the seat and mirrors before moving, rather than at the first junction, means fewer fiddly changes in traffic. It also helps to know how the instrument warnings are presented, so nothing comes as a surprise.
Multimedia and Connectivity
Taking calls is a separate question from playing music. Where hands-free calling is supported, what matters in practice is how clearly the person at the other end can hear you over ordinary cabin noise.