But where does he end up with the "primitive cultures"? To me it looks like it was just imaginary concept used as a tool. Once you understand that development

But where does he end up with the "primitive cultures"? To me it looks like it was just imaginary concept used as a tool. Once you understand that development of cognitive abilities are related to environment and that they are not necessarily "levels", you can forget the whole idea of "primitive cultures". This is prime example why one should sometimes "entertain a thought without accepting it".