That's why this is only offered on new cars, I imagine that Nissan would provide the dealers with some kind of mask template for each model of car they sell and the service mechanic throws this mask over top of the car, lines up the 4 corners and begins spraying. Heck, devising a quick way to put the mask on for a quick turnaround could even become a patent making this unprofitable for other dealers.

Regardless, my point was mostly acknowledging that even in mature industry's there seems to be room to innovate.

They are only painting half the car.

It's not because of that. They are also covering all the plastic components (maybe it attacks plastic?) so it's still a lot of work even if you don't have to cover half the car.