Why are private rooms in Japan opaque?

In the private rooms of Japanese cuisine, translucent glass is used as the partition of the dining area. In addition to ensuring the privacy of customers, we should also let the light in. Japanese people pay more attention to personal privacy. In addition, in order to avoid the noisy environment, it is difficult to calm down and enjoy the food. In addition, it will not affect eating next door, close the door, and be free from external interference.