We’ve talked about this.
‘Why Malcolm Gladwell matters and why it unfortunate,” this cognitive scientist sums it up:
UI don’t think the main flaw is oversimplification (though that is a problem: Einstein was right when he—supposedly—advised that things be made as simple as possible, but no simpler). As I wrote in my own review, the main flaw is a lack of logic and proper evidence in the argumentation. But consider what Gladwell’s quote means. He is saying that if you understand his topics enough to see what he is doing wrong, then you are not the reader he wants. At a stroke he has said that anyone equipped to properly review his work should not be reading it. How convenient! Those who are left are only those who do not think the material is oversimplified.