You're misunderstanding the rant.
There are some interfaces which are absolutely superior when provided as picture under multi-touch glass.
Superior to what? I think you mean superior to mouse + keyboard, and superior to a physical map. The author agrees with you, as he clarified in a followup [1] to the rant:
> [Do I think the iPad is bad?] No! iPad good! For now!
Do you remember the first time you used a map on a smooth multi-touch screen?
He goes on:
> In 1900, Eastman's new Kodak camera was good! The film was black-and-white, but everyone loved it anyway. It was genuinely revolutionary! But it was also obvious that something was missing, and research continued. Practical color film was released thirty years later, and gradually took over.
> [...]
> Today, iPad good. It's flat and glassy and everyone loves it anyway. It's genuinely revolutionary. But if all we have in twenty years is an iPad with a few haptic gimmicks, that'll be bad.
The first time you used a map on a smooth multi-touch screen, it was genuinely revolutionary—hopefully, you'll be similarly impressed the first time you use a map with purpose-built physical controls (not mouse + keyboard), but that is also dynamic (like a computer/tablet/smartphone). Maybe it'll be something like this: https://rsnous.com/posts/notes-from-dynamicland-geokit/
[1]: http://worrydream.com/ABriefRantOnTheFutureOfInteractionDesi...