Japan language is awkward language.
You can’t smooth communication with Japanese people , even if you mastered the Japan language.
Japanese people wont say openly opinions and requests.
Japanese peaple use euphemisms for Japanese.
It is the unique Japanese way of communicating “Judging by the atmosphere”
May not convey meaning even among the Japanese.
Most Japanese cannot speak Japanese only.
So you had better to hire japanese staff when these pesky Japanese customers!