Earlier quoted context omitted.
Because no one wants to deal with someone who can't speak Japanese on Japan. As I stayed above, it's a barrier of entry.
While I've never had any first-hand experience with Japan, it is said that there is some degree of discrimination that stems from cultural differences. Stuff like foreigners find it more difficult to rent apartments because the owners are concerned they won't be quiet enough and disturb the neighbors, or won't sort out their trash appropriately, etc. I don't think language is the only issue. Japanese work culture als…
If what you all said was true, why do foreign enterprises profit in Japan then?
Language is culture.
Culture is people.
You seem to be missing the big picture, and that isn't bad - it just means you should try to improve your ignorance.
Plus, all the issues you said apply anywhere in the world.