I totally agree that tablets suck for creation. But I think you're assuming that programming is the only thing to learn via a device.

In my day job we make educational HTML games for kids learning english and math. A heap of schools use this as part of lessons, and we get a lot of extremely positive feedback from teachers.

As to whether an iPad is better than a computer? From a kid's UX, and IT infrastructure POV, tablets are generally seen as better/easier to use and maintain.

At home, I try to keep my kids off screens whenever I can though...