1. Because extra large space solder body builders who are insecure about their masculinity are not moe, and wouldn't interest the Japanese.
2. For the time being, Microsoft does not care enough about the Japanese market to try and force feed them yet another franchise designed for brain dead American teenagers, by ignoring the difference in culture and assuming the only thing American media needs in order to become popular in japan is to have a anime made out of it.
worked wonders for Marvel comics after all!
3. Because you touch yourself at night.