I have owned multiple P cars over the years and although great cars, they are far from immune from minor issues. My 997 Turbo (1st gen) had front suspension rattles early on and I had to take it in for the dealer to replace the front suspension under warranty, twice. My current Cayenne GTS has, at 10k miles, started giving me fuel level indicator faults. A foggy tail light on a Mac seems trivial compared to these issues, but who gives a damn, so long as its an easy fix with no structural defect/damage to the car. I remember the almighty Metzger block in some cars suffered from an oil leak that required a complete engine rebuild to fix.
Just to throw another dirty towel in the bucket, my current range rover has about 4000miles on the clock and has already had 7 recalls made on the car, a leaking radiator replaced, and a noise and vibration from the engine/gearbox (cause not yet unidentified) at certain rpm range.
Fact of the matter is that all cars are expected to have issues. Some less than others. The newer it is the less chance they would have had to wrinkle out the issues. Add to that that the fact that the Mac is a hand built car that was designed from scratch and manufactured in small quantities then it is expected that you will face some issues compared to Porsche or other more mainstream and mass produced cars.