I agree with those comments, and it is one of the big things that Rickson, Pedro Sauer, Ryron and Rener, etc. have been going on about for some time now. The emphasis on sport in the form of grappling competition has led to many movements and positions in BJJ that leave you completely exposed to strikes. This is a fundamentally different philosophy from the origins of the art, and one of the big reasons that I am fan of a standardized curriculum, particularly for the early belts, so that all students get exposed to those concepts and practice them while rolling.
Later on, if someone really gets into the competition scene, they can move to some of the more crazy positions or techniques. However, I think it is worth noting that guys like Roger Gracie, Kron Gracie, Xande and Saulo Ribeiro, etc. are still kicking tail with "basic" BJJ. So, I am honestly not sure that some of those positions are essential for succeeding at high level grappling competitions.