911's Don't depriciate as much as other luxury cars. But they still do depriciate quite a lot. If you want to turn a profit on a 911 best buy a 996 now thats in propper condition now.
Go to the dealer. It's a known problem and if the car has a valid warranty it will be fixed free of charge. If you leave it too long the electrical could potentialy burn out.
Thats exactly the point of Porsche? It' s exclusivity and quality over mass. Leave it up to Tesla to build cheap massproduced cars and charging infrastructure.
Ceramic coating is a hype, don't do it. But I do have PPF on the whole car. I have a Cross and do use it like one (gravel roads, forrests, etc) so I want to protect the car completely. But if your only doing on-road I would have put it only on the nose.
You can also go to your dealer and order European vizors for the cleanest OEM look. UK versions for the passenger side and mainland European for the driver side.