This is bullshit. Not everyone has to be better in math, just like not everyone is better in music or language or biology. In fact for English learners they should spend first few years in just getting them to level in English. Fix the fundamentals and rest will follow. This is the opposite.

Delaying is not going to do thing for kids who are not into math, but will screw others who are into it.

Just imagine if Ramanujam has to wait till 9th grade to learn math.