Patek is imo art ( so are Breguet, Lange, ...)
I mean not only Picasso , Van Gogh, Rodin, Michelangelo, Rietveld, ... made art. I really do prefer a Patek watch above a painting, a vase or a chair. To each his own I guess.
But when you say : 'I can order a $100K Porsche with any color I want, in and out, auto or manual transmission etc, without damaging the Porsce name. If Porsche can customize my car, with greater production rates' ......Well I don't think you van buy a famous painting, send it back to the person who made it and ask him if he can paint an extra tree on it ;-)
You buy what you like and if you don't like it , than buy something else. Patek made exception for super clients like Graven and packard but that was long ago. I doubt they would still do it today. And if they would it woul't be for an entry level watch.