I just knew it today and really surprised.
It means that a lot of English speakers cannot use English correctly, doesn't it?
I was somehow relieved to hear that because I could notice that many people were struggling to speak English well, like me(I think). I'm one of them. It's not special for us not be able to speak English well.
It does not mean that we don't have to use English correctly(properly? I don't know which one I should use).
We are running toward the same direction and the goal is "be able to use English perfectly". I think every one learning English hope so.
Nothing is better than speak English like native people.
I wanna be a good English speaker as EARLY as I can. :D hehe