It's the tepid nature of this statement that I am most against. Despite the fact it's also just downright wrong - the malleability of the brain is close to miraculous and studied heavily in many areas of science.

Rats that are kept in cages devoid of adornment have smaller, less dense, brains than rats that have toys and varied sonsory stimulation. It's simple, the more things we have with which to think, the better and more complex our thinking can be.

Think Orwell's Newspeak and Herman Hesse's Glass bead games.

What is awful here is that you seem to be convinced that mediocrity is a worthwhile tactic for people and for children... and I think this rips the heart from the very idea of what it means to be alive and better oneself.