Comfort and Convenience
Comfort preferences differ because body proportions and driving habits differ; a seating position that suits one person's reach to the wheel and pedals can feel wrong to the next driver.
Safety and Driver Assistance
Finding where the lights, wipers and demister controls sit before setting off is simple preparation, so a change in weather does not turn into a search through unfamiliar switches while moving.
Multimedia and Connectivity
Keeping a phone charged on a long drive is a separate need from playing music or taking calls; where a car supports all three, they may still rely on different sockets or settings.