It could be a case of classic market segmentation. The lower tier customers get the incomplete or error-ridden documentation, and the upper tier trusted custome

It could be a case of classic market segmentation. The lower tier customers get the incomplete or error-ridden documentation, and the upper tier trusted customers^W'partners' get access to the juicy stuff: complete and mostly correct documentation, including stuff intentionally left out of the lower tier package like application notes containing secret hardware handshakes to unlock hidden features, all under strict NDA of course.