Comfort and Convenience
Power mirrors illustrate the distinction: a switch selects which mirror is live, then a separate directional input sets the glass angle. Choosing and aiming are two steps, not one.
Safety and Driver Assistance
The electronic stability program acts when the car's rotation differs from the steering input. It brakes individual wheels to pull the body back toward the intended line before a slide develops.
Multimedia and Connectivity
An AUX input carries only an analogue audio signal. The connection exists whatever plays through it; track names, artwork and control stay on the source device rather than travelling down the cable.