Comfort and Convenience
Cabin temperature is a personal matter: what one occupant finds pleasant another finds stuffy, since clothing, the time of day and plain habit all differ. Agreeing on it early tends to prevent repeated fiddling later.
Safety and Driver Assistance
A few unhurried minutes before setting off, spent setting the mirrors, locating the wiper and light controls and settling the seating position, mean fewer unfamiliar actions later. Sorting anything out while stationary is simply easier than doing so in traffic.
Multimedia and Connectivity
Keeping a phone charged through a long day is its own need, separate from taking calls or playing music. If a charging point sits within reach of where the phone usually rests, the cable stays out of the way.