Do you have any data to back up your claim that there is no difference between STEM and liberal arts skills from a source other than your two nephews? This is a huge area of research in education with a long history of detailed study - your anecdote doesn't carry much weight, and your assertions don't align our current understanding. Although the idea of "multiple intelligences" no longer has the influence it used to, there are still very clear distinctions between, for example, quantitative and analogical reasoning, and inductive and deductive logic, and some people grasp certain kinds of concepts more quickly than others. This is reality. One of your points seems to be that kids shouldn't be taught in a way that only focuses on their strengths, and I fully agree with that, but it's important to understand that there are real distinctions among cognitive skills.

> The sooner we stop complaining and start doing...

Start doing what? Just in the US, there are over 7 million teachers heavily involved in "doing" education as best they can, and tens of thousands of researchers and policymakers that are trying to structure education effectively. I agree that the author of the posted article is also not making an informed contribution to the field, but it's important to recognize that there are many people who are making real contributions, and many others who are too eager to change things based on their own intuitive (and frequently incorrect) impressions of how to teach.