There is a guy named Paul Klein who has uploaded YouTube videos of his new Red Eye. Off the truck, bringing it home, hey, look, this is unsat rock chips on the rear wide body fenders, and he did one where he documented rust on the brake parts, etc, and was pretty upset. Either rust from stored parts before assembly, or perhaps...sitting outside waiting to be shipped? He has a point that an 80k plus car shouldn't arrive with rusted parts, methinks.
there are unfinished steel / cast parts on most new cars - the tie rod ends and machined faces after the part was manufactured. This is not structural compromised areas due to corrosion / rust.
-just a handful go through painting (spray or dip), most do not.
In the old cars - these are referred to as "natural" finish where there was no paint, plating or galvanized coating.
look under the major Japanese brands and its a similar thing as well with unfinished surfaces will have surface rust / oxidation.
Exhaust systems, driveshafts, suspension control arms, fuel tanks etc.
Its totally normal for brake rotors to have surface rust.
Wash the car and after it sits over night, the rotors will have rust. A vehicle sitting on the lot will have it after sitting in the rain. Apply the brakes and the pads scrape the rust off the rotor...normal.
The widebody models have PPF on the lower front section of the rear flares - probably was noted that this was appearing as claims by new owners.
Personally, I'd apply PPF to the front leading face of front flares and put this one front face of rear flares. If you drive on chip-seal roads or areas where there's sand, grit gravel - airborne debris throw up from the front tires is going to chip the paint.
Ask owners that are in areas like Oregon or Texas - those roads are known for having debris...and PPF is one way to combat that. Or never drive the vehicle...