I think the Lysenkoism of our age is all people are equally intelligent and equally good at all things, thus one size fits all education is an ideological imperative. There are too many unacceptable facts that lead to conclusions that contradict this ideology in the kind of approach you're talking about.

If all children do not perform roughly the same, ideologues will not think that people have naturally different talents and abilities, but instead think there are implied violations of laws protecting against discrimination in education. That being said, I'm sure homeschoolers and people not indoctrinated, even those with lesser abilities, will really appreciate this approach.