It comes back to that principle of balkanization. What if someone posts a crucial piece of information in French or German? I can't read either; if I'm searching for that information I won't find what I need. While it benefits the community that speaks a given language it puts the larger FT community at a disadvantage and precludes access to information. Imagine if the Tokyo forum consisted of posts primarily in Japanese? How would that help those wishing to find out information on Japan that don't speak the language and most need the help?