What that attitude ends up doing to these growing, plastic brains is that it teaches them to live a life filled with anxiety and dictated by those around them. They spend their early years running from school to extracurriculars to homework and then back to school. Always supervised by an adult, never slowing down, never doing things on their own.

Intellectual development is not the only kind that happens during childhood, they're also learning valuable life skills, and if you run their lives for them in pursuit of one kind of development you're going to ruin other kinds.