We won't be doing any PPF on our MYP. We're only going to keep the car for 3 years. This will be the 1st car we haven't kept for 10+ years. The pace of change with EVs is just too fast to hold onto a car (happily) for that long.
The one experience we have with PPF is with my wife's Range Rover Sport. We did full PPF and ceramic. The ceramic definitely made it shine. I'm not at all impressed with the PPF. It's been just a little over 3 years and the "self-mending" PPF is not mending.
There are clear impact points (quite a few) that have penetrated and are quite noticeable. The shop that did the work will replace it but want the car for 5 days. My wife, of course, just does not want to deal with that. I think the front of her 3+ year old car with protective PPF looks worse than the 13+ year old car that we traded in for it. The shop asked if we do a lot of high speed driving, which we do. We actually only put about 4K miles a year on it, but once a year we go on the same road trip that is about 1K mile round trip and I probably average 110 to 130mph for long stretches of completely open road. Apparently that is brutal on the PPF.