I worked closely with Germans and Swiss Germans for many years. Great guys. There are upsides and downsides to the perfection mentality.
Much of what is designed is designed to live in a German style ecosystem, in which the only people maintaining the system or product will be highly competent, consistently trained, and properly equipped. When all that is in place, you can build great things, and have them stay great for extended periods. Outside of that ecosystem, results vary wildly.
One of the amusing things we had going when working together was their discontent for me getting into lots of "Do it by your own" projects on my house and vehicles. Some of them would give small things a try, but for the most part, they liked to have the "meister" working on their cars and houses. One had a kid that was in the midst of a multi year training/apprenticeship program to become a house painter, which was a common way to get into a trade as people prefer to pay a highly skilled person to do excellent work, and plan for that when deciding to have work done. When he found out that most of our house painters start out by painting customers houses while a guy yells at them some, he was horrified.