Along with many other things PS - but I certainly agree on this point.
The ability for people to investigate a problem, think of potential solutions and extrapolate their findings into a workable fix for it seems to have been relegated to a very distant point on the league table of practical good sense.
Of course it doesn’t help (in this case) as there seem to be few true mechanics remaining at large in that murky world now that the majority of the wildlife in car workshops seem to be little more than fitters possessing the skill to change parts like for like but bereft of any nous to actually repair anything than can be fixed rather than replaced.
It's down to how people are trained and the backup they receive too, IMHO. In the company I work for (another German high-tech company, as it happens) we have a group of technicians who, 10-15 years ago, were working on complex electronic systems at component level. They were able to diagnose a problem down to this level, get the soldering iron out, replace the defective component, and make the customer happy.
The literature they were given was a service manual containing a schematic of every module inside the device with a brief description of how it works and how to test / calibrate it. The rest was down to them.
Nowadays, for various reasons, many faults can't be repaired at that level any more, so swapping larger modules is the best way to effect most repairs.
They now get a manual stating that they run a piece of software, which tells them which module is breaked. It includes big colour pictures of the module and precisely how to remove a couple of screws and lift it out of the instrument so they don't get confused. It reminds them to wash their hands after going for a pee, not to eat yellow snow, etc.
As soon as there's a problem that the guy who wrote the service manual / software didn't anticipate, swapping modules at random is the only solution whereas, if there was still detailed information available, a decent technician could work through the problem and resolve it, even if it amounted to swapping a module at the end of the day.
The point I'm making is that, if you treat service technicians as idiots, that is exactly what they will eventually become, unfortunately.