Keep in mind that the Japanese players are not big on forums, either. They actually prefer to do all of their strategizing in small groups of IRL friends. While I can't say anything about what the Koreans will bring to the table, I don't think it should be based on anything you find on the internet.
If you look at some interviews from past Japanese champions, people like Tsuguyoshi Yamato and his group of 10ish friends call themselves the "Achamo's" aka torchic's and they get together and just playtest everything!
The Japanese are doing something right - they do VERY well every year in both TCG and VGC.