Case in point: The iPad and iPhone makes kids creative like no other tool has before. Kids know how to use it to text, exchange ideas or pictures of kittens, draw or sketch, learn how to program (Swift Playground anyone), take and edit photos. It is everything but a glorified TV where kids are passive. This is the only environment where kids are truly first-class citizens. How on earth Kay could spend so much energy (a whole article) trying to convince us otherwise based mostly on super-weak arguments like "nobody is using the Shake gesture to undo" is truly beyond my understanding.
Don't get me wrong. The Dynabook was a somewhat interesting idea. But it's about as much an inspiration for the real thing we use daily as the Star Trek tricorder. What Kay, to this day, did not get, unlike Jobs, is the power of networking, both physical and human. What made the iPhone greater than the Dynabook ever would have been is the App Store, and the combined creativity of millions of developers. What made the iPhone greater is apps like Messages, Facetime, Facebook, Twitter, Whatsapp, and countless others. What made the iPhone greater is Instagram, Flickr, sport apps, medical apps, HP-48 emulators, 3D "kill them all and think later" games.
By contrast, what would have made the Dynabook great in Kay's mind was "designed by Kay for Kay's personal interests". Or, as Fake Bill Gates would have said: "One programmer should be enough for everybody".