>If I'm applying for a work visa where the work I'm doing would require me to know Japanese, I should know Japanese.

the naturalization act of 1906 and the immigration act of 1917 , in the US, were some of the hardest fought-for and controversial laws ever put in place.

The immigration act got vetod by 3 different sitting presidents in different forms , and the naturalization act included a 'free white persons & natives' clause that screwed over a lot of people.

It was pretty widely seen as a method to minimize poor working people. Both laws were used a ton during the commie red scare against citizens, and the 1917 law is essentially held responsible for the separation of families / 'port of entry tragedies' that separated families based on things like language.

now : i'm not saying that Japan is walking in the same foot-steps, just pointing out that language/culture exclusivity within legal spheres usually ends poorly for the people.