> Map and reduce are not obscure. They’re the basic building blocks! Conceptually basic != basic for humans. The more basic and "simple" the maths, the harder

> Map and reduce are not obscure. They’re the basic building blocks! Conceptually basic != basic for humans. The more basic and "simple" the maths, the harder it becomes for human beings to understand (otherwise most people wouldn't fail first years of higher education maths that often).