A child who is a native speaker usually knows many things about his or her language that a non-native speaker who has been studying for years still does not know and perhaps will never know.
"Don't you think that people from English-speaking countries earn an unreasonable amount from the English language industry? Since I'm Japanese, I'd like to use materials exclusively made by Japanese people." "But you know, you can't really tell if the English is good or not unless it's been checked by a native speaker." "What do you mean by good English!? English used by native speakers? Are natives really that great, anyway?"