The problem with this article is that it makes a huge logical leap from saying a short person is highly unlikely to become one of the best 400 basketball player

The problem with this article is that it makes a huge logical leap from saying a short person is highly unlikely to become one of the best 400 basketball players on earth, to then say resources shouldn't be wasted on kids that are perceived as slow in primary school. Height is an easily observable phenotype, cognition is massively more complex and dependent on many genes that are not well understood. Furthermore, cognitive ability is heavily dependent on upbringing, and cognitive ability develops at different rates for different people. Not to say that the school system should be cookie cutter, but we in no way have enough knowledge about human cognition to determine a child's career path because of their performance in kindergarten.