Comfort and Convenience
Some drivers like sitting upright and close to the wheel; others prefer a longer, more reclined stance. Height, arm length and simple habit explain much of the difference, which is why no single position suits everyone.
Safety and Driver Assistance
Controls are easiest to learn when the car is parked and there is no traffic to watch. Setting mirrors and locating indicator, light and screen functions is simply easier done in advance than improvised in motion.
Multimedia and Connectivity
Calls are a different need from music, and worth thinking about separately. Where a hands-free function is available, a conversation can continue without handling the phone, whichever method the audio itself arrives by.