How to understand German flavor and Japanese photography style?

From the perspective of photographers:

Generally speaking, Wade refers to the characteristics of high sharpness and saturation, high light contrast, and some of them have a slight graininess (not noise with high sensitivity), and the shape and overall feeling have a relatively tough feeling.

Generally speaking, the sharpness and saturation of Japanese will be slightly lower, with a little hazy and soft feeling, low light, soft modeling and overall feeling, and some will maintain low sharpness and slightly increase saturation.

However, judging from the world photography history itself, there are no so-called "German flavor" and "Japanese style" photography schools or categories, which are just terms spontaneously invented by photographers in China.