Comfort and Convenience
During stop-start traffic, some drivers like to rest an elbow against the door, while passengers in the same cabin may want more room at the shoulder.
Safety and Driver Assistance
While still parked, a driver can note where the window and lock switches sit so a later drive-through stop is a known sequence rather than a hunt.
Multimedia and Connectivity
A driver who needs to return a short work call at a rest stop is dealing with conversation, not music; if calling is available, it is still separate from charging.