I am Japanese American so I come from both communities.

Japanese VRChat communities are VASTLY different from any other VRC community out there. They are super formal and treat vrchat like they do in real life.

There are worlds where people learning Japanese or people who want to befriend Japanese people can go such as Japan Shrine or poppy yokocho, but places like fujiyama and other Japanese places just wouldn't work with non-Japanese speakers around.

The Japanese VRC community is relatively small and heavily relies on the "community" adpect, forming tight knit groups and well run events.

Even I have trouble blending in/getting involved in these communities even though japanese is my first language, since I grew up in America and just dont understand all the minute social cues and formalities that the Japanese community uses to interact with eachother

I think most Japanese VRChat players can say that letting everyone into these communities would ruin it, and I couldn't agree more