You are comparing Tesla to other car manufacturers. Tesla is different; they are not trying to be like other cars.I'm not sure that it's that big of an advantage. New changes are made every year to a car. It's just that they do a total body platform/face lift change every 3-5 years. But year to year, you always have changes to a car. That's why they always ask you what year the car is. Sometimes they do mid year changes in which case it's important to know the date of manufacture. Like the infamous balance shaft problem on Mercedes engines, at one point in the middle of the production year they changed the part so you could figure out by the serial number of the engine if you had the bad part or not.
Two major things that I like about regular car companies is that there's a dealer network so they compete on prices. You're stuck with list price. You can also get repair manuals and 3rd party manufacturers also make parts for a car that has some volume. There's a very limited amount of parts available on rockauto for Tesla. For instance headlamps are a typical crash part, don't see those on there. You're basically stuck with the manufacturer who can charge you whatever they like.
Sandy Munro made the continuous improvement analysis; he is considered perhaps the leading auto manufacturing analyst.
Manufacturers buy his analysis to improve their companies.
I like your MBZ balance shaft point. Tesla has something like 17 moving parts in their drivetrain. Pretty much bullet proof.
Regarding dealer network, you are paying for those big beautiful buildings and salaries. Not to mention new car inventory carrying costs, dealer revolving credit to buy the cars, etc.
Regarding parts, the main problem Tesla has is getting replacement parts to body shops. This is a big complaint from owners.
Regarding headlights, the Tesla Model 3 has been dubbed by the Insurance Institute of Highway Safety (IIHS) as the car with the best headlights in the market today. All Tesla vehicles feature LED reflector headlights for both high beam and low beam functionality. LEDs last a looooong time.
Due to regenerative braking, brake pads last a minimum of 150K miles, many expect 300K.
Normal maintenance items are few. The 1st scheduled service for our car is at 13K miles; the service center inspects the car; that's it. No parts.
I appreciate your thoughts. These cars are different.