I personally think PPF is a must, but perhaps it depends on your road conditions and your paint colour. Mind you, I’m quite particular about the paint on my cars.
Perhaps with white paint and good roads, you could get by with no PPF, but I had my previous black car for 2 years and was constantly touching up paint chips on the bumper, hood and mirrors - I’d say at least a dozen or maybe 2 dozen chips in 2 years. When I got my black Model S, I wanted to protect the paint so I got full front PPF and I haven’t had a single chip in the past 4.5 years - just one tiny gouge in the hood PPF and I’ll bet the paint underneath is fine. More incredibly, I scraped the front corner of my bumper on a curb once, and although the PPF got torn to shreds, the paint underneath was pristine. All I needed to do was replace a small patch of PPF (detailer did it for free), and my bumper was as good as new.
When my Plaid arrives, I’m getting the entire car wrapped in PPF - that way I can worry even less about minor door dings, chips in the glass roof (I’ve had two roof chips in my 2017 Model S), and scratches on the door sills.