Comfort and Convenience
On a cold morning school run, a rider in a heavy coat may want less warmth if heating is in use, while a passenger in a light jacket may want more. Clothing, not a single shared taste, explains the split.
Safety and Driver Assistance
A foggy exit from a workplace car park is easier when the demister and washer controls have already been located in a still cabin. That preparation is about the layout, not about reacting once the car is moving.
Multimedia and Connectivity
During a weekend errand, a child may need a story from a phone at a volume others can ignore. Cabin audio, where present, can carry that story alone; charging the handset and taking a call are different jobs.