Comfort and Convenience
Cabin temperature is largely a matter of taste. Passengers who feel the cold often want warmer air than the driver, which is why settings get adjusted repeatedly on shared journeys.
Safety and Driver Assistance
Mirrors, seat and steering position are better set before moving off than at the first junction, since stationary adjustment takes seconds and needs no divided attention.
Multimedia and Connectivity
Hands-free calling and music playback depend on different things: one on a microphone, the other on an audio source. Checking each separately avoids confusion mid-journey.