I have never gotten PPF for any car. I've never regretted not having it. However, my attitude is that it's a car, not a painting by Rembrandt. It's not going to remain pristine. I generally keep a car so long that there's no way to keep it in mint condition, so I don't worry about it. The few hundred dollars difference in re-sale value by the time I'm ready to trade up would not be worth the stress of trying to keep it pristine. I wash my car once every couple of months from spring to fall. It's too cold to wash it in winter. I go to one of those places with a pressure wand and a soapy brush and get it mostly dry with lint-free towels.
If, as you say, you are OCD about keeping a car in mint condition, frequent hand-washing, waxing, etc., and you get pleasure out of admiring how nice the car looks, then I suppose you want PPF. I know some people think it helps. Note that a big enough pebble will still damage the car, but I suppose you'll be able to wash dirt and bugs off more easily.
Anyway, welcome to the forum, and congrats on your soon-to-arrive Model 3. Note that EAP takes a bit to get used to, but once you learn to use it properly, it's a dream.