> By the time your kid is 10 most people would have already bought a new computer 2 times. He can just use one of your old PCs. You don't need that much performance to learn.

By the time my first kid was born, I’d bought a new computer...well, a whole more than two times. And he’s five, and I’ve done more than two since. But the ones that aren't repurposed and in use also aren't reliable (that's why they aren't repurposed), and while you don't need much performance to learn (a plus for the Pi because it's not a master of performance), having something trustworthy is valuable. (Sure, in some cases the reliability issue is fixable with replace parts costing more than a Pi, but then...)

It strikes me that your definition of "most people" does not, in fact, include most people.