I speak a bit of Japanese myself as I was station in Tokyo for a while. Can't read and write it though sadly. I dontmind learning the language if it helps me get into more parties. Though if jp only parties are deemed as ok then so should English only parties and English only servers as well as international servers. If a Japanese person needed a ride in my car to go to the same place I am going, I wouldn't tell him no because he doesn't speak English. For the ifrit battle I can see the language barrier being an issue but not when it comes to grinding parties.