>>1920753The problem with that is that most people quit learning a language early. Fewer and fewer people stick with it the more advanced they get. This pretty much means that in order to appeal to a large audience you either are going to be teaching the very beginning like kana for the millionth time or teaching useful or interesting vocab. Another issue is that for native Japanese people they don't have experience learning Japanese like a foreigner would, nor do they have experience as a language teacher. There's a difference between someone being able to have correct grammar and someone who can explain why it's correct other than "It just sounds right / wrong."
