Yeah I completely agree with this, 100% - if they ever step outside their cozy bubble there's probably a lot of people who can and would help to improve the game, but it's all very insular and protected, removing the potential for many outside of Japan to step in and help a very, very underdeveloped avenue of gaming.
One thing to remember is that Illusion continue to push some boundaries with each game, and those aren't easy-sell boundaries for other cultures - games like Biko and Rapelay couldn't be released anywhere else, which means they're already tied to a mostly single-country audience. Thankfully we have people around to push them out to us.