Can't remember where I read it, but it was an interesting opinion nonetheless.
German cars are less reliable than Japanese cars in general, because
the German mentality is that, if a part is designed to be adjusted or replaced at a certain interval, it should be. And the owner will follow the instruction. And all will be well.
However, owners are not always as reliable as the German manufacturer thinks they should be.
And so, the car goes kaput.
Whereas, the Japanese manufacture similarly well-designed and built components, but know that the owners are unreliable humans, and that indicated intervals are treated as advisory, rather than mandatory.
Who knows how much veracity is in this.........