Luxury cars vs basic cars..
My last job before retiring, I worked for a "fortune 500" high tech company, making all kinds of electronics for most all brands of cars & trucks..mass air flow, ignitions, sensors, controls etc. Every part was tested before being crated & shipped. They were graded on the "bell curve", and some insisted that their parts all come out in the highest say 20% of the bell curve..others the highest 30% etc. Parts which scored lower on the curve, were not "bad" parts..they just didn't hold to the very narrow parameters demanded. likely those which scored low would last as well as any but they wouldn't hold the very fine edge for part performance. The units that were low on the curve, were sold to "after market" suppliers.
Some of the companies that I recall having a very high on the curve demand were Mercedes, Volvo, Honda, Porsche & Toyota..while domestically, Ford was very demanding...but that is truly "splitting hairs". These companies did not order "high on the curve" parts for their expensive models only..the same quality went into their whole line. Years ago, this same company made alternators, regulators etc.
The shafts, windings, diodes, ball bearings etc were the same quality, whether the alternator went into top or bottom of their line.
For my own use, I endorse the KISS idea (keep it simple stupid). I buy new cars & trucks with 4 cyl engine, 5 speed manual trans and no elec windows, electric control for transfer case or any more "geegaws" than what I actually need. The idea being that most parts are very dependable now, but the more unnecessary devices you have on a vehicle..the more you have that can fail.
Actually quite simple..if I don't have electric windows or locks, then my electric windows or locks can't go wrong..If I don't have electric transfer case control or a "sensor that reads road conditions 5 times every second" (as BMW brags), then neither of these units can fail.
Yes, luxury cars may have a higher repair rate...because they are more complex with more things to go wrong. It would seem obvious then that the more you pay (for "extras"), the less dependable they are.
However, Once the parts arrive at the auto factory, then workmanship also plays a part..it would seem then that if a worker is having a dispute with the company or has such a solid lock on his job that it is nearly impossible to fire him, his workmanship may suffer.