[EasyMark]

It cuts way down on the amount and expense of wiring, copper is expensive. It makes it easier to pocket some more profit.

[ranger_danger]

just wait until wireless CAN comes around

[EasyMark]

I can see fiberoptics, but wireless just wouldn't be reliable. There are too many sources of noise in a car, plus rush hour traffic with dozens (hundreds?) of cars nearby broadcasting on similar frequencies.