My point is that we shouldn't continue to allow people to turn "I have an advantage in math" into "I'm terrible at spelling and won't bother trying to get better." My nephews illustrate that advantages don't have to become liabilities in other areas, which is how this dichotomy is presented in the OP and the article it was responding to. The scientific evidence can certainly illustrate advantages and disadvantages in different areas; getting from there to "some kids are terrible at English and the rest are terrible at math" is a huge, unwarranted leap.

I agree with everything else you have to say.