Comfort and Convenience
Cabin temperature is a personal matter. One occupant is content with cooler air on a mild morning while another prefers warmth, and clothing, time of day and plain habit account for most of the difference.
Safety and Driver Assistance
Setting up before setting off is usually worth the minute it takes. Confirming seating position, mirror views and the reach to the pedals while stationary means those small corrections are not being made during the journey itself.
Multimedia and Connectivity
Hands-free calling answers a different need from listening to music, since the point is a conversation that stays intelligible to both sides. Where such a function exists, the practical gain is leaving the phone stowed.