The paint armor is a laser pre-cut kit they can easily (relatively) install. A full hood on a hood as large as the model S is far more difficult to get it blemish free. Then, once you get rid of the hood line, someone is going to say... "Why is there a line on the fender?" Then we're all going to complain that they should full wrap the front fenders up to the door.
You can always opt out and get it done aftermarket should you change your mind.