Yes, but when your McLaren brake pedal starts feeling soft 6 months after you purchased, you might value a dealer who can:
1) Identify that it's a brake valve issue they've seen in a few of the same model, saving you time in troubleshooting, and potentially saving a major crises if left untreated
2) Loan you a suitable replacement vehicle while they service your car
3) Push back against the manufacturer if they don't realize this is a systemic issue that needs to be addressed
4) Suggest you buy a different model in the first place, because they, ultimately, are the ones that suffer more than the manufacturer if you aren't pleased with your purchase, and are in a unique position to see how real world users are finding the value, reliability, and quality from various models, accessories, and driving styles.
Analogies are always imperfect. But I find yours a pretty strong one for the value of a great Value Added Reseller and great Customer Experience overall.
Not to mention your analogy included shade, a concierge, and a history spiel - the car equivalent of the leather sofa, coffee machine, and first name terms. So you do appreciate being treated in a manner commensurate with the purchase you are making