Comfort and Convenience
Preferred cabin temperature varies widely between occupants; what one person calls pleasantly warm another finds stuffy. Clothing, the time of day and simple personal tolerance all feed into where someone sets the temperature.
Safety and Driver Assistance
Drivers stepping into an unfamiliar car benefit from a short pause: check how the lights and wipers are switched, adjust the mirrors, locate the parking brake. Preparation done while stationary need not compete with the road.
Multimedia and Connectivity
Taking a call on the move is a common need, and handling it without holding a phone is the practical aim. If hands-free calling is available, audio typically pauses, then resumes afterwards.