I have watched a couple o videos recorded by Mr. Steve Kaufman, the canadian Linguist, at his youtube channel on the subject of language learning. In this case about the criticism of some lin guists that consider that Mr. Kaufman hasn't the credentials to speak about language learning. In response to that Kaufman defends his approach by saying that the experience is much more imortant than the amount of statements of scholars on the subject of language learning.
Mr. Kaufman desagree with the theory of Chomsky about the universal grammar. As often happen with the majority of (most of) theories, the Chomsky's universal grammar theory cannot be supported by the experience. Sometimes, scientists complicates the understanding of a social and cultural phenomena, such as the human language. I'm completely persuaded and convinced thanks to my own experience, that Kaufman is right.