Just like how xmpp.jp is very long standing. Perhaps it's to do with their mindset. Casio still manufactures the same watches they did in the '80s because they design / create things with the idea that it should stand eternally. I don't know if that's truly the reason but somehow I trust them to be competent. Actually that's not why that page has a separate section for Japanese servers, it's a website for learns for the Japanese language.