It enables your child to design robotic machines that work (while learning the first year curriculum in computer science and engineering), even if your child is as young as nine.
It's not about building the designs included. It's the total freedom to materialise any mechanical logically controlled idea. Enables your child to take a gaming remote control, and control a car they designed and built them self.
(unlike the "predecessors" Mindstorms 31313, and Boost, the Scratch language and editor are intuitive for kids (as in "explain me like i'm 5")).
Lego deserve the ultimate praise and accolades for designing this ultimate accessible product.