One of the stupidest tech questions I've heard in a while. I haven't read the TFA, of course :)
The iPad is shiny, substantial, and satisfying. A bit like a big, juicy steak. Not cheap, not good for you or the ecosystem, but darn delicious. Both sell primarily because of the satisfaction they bring to their consumers.
A phone, on the other hand, does its basic function well even without a visible operating system. It's also something you need and will buy without too much thought. It's like the Taco Bell burrito. Android is its soy-based, meat-flavored filling. Practically free to the manufacturer, and good enough for its purpose.
Though you tolerate soy-filled Mexican fare for $5, you won't order grilled tofu when you go out to eat in a fine restaurant where you'll be shelling out $100. You order a steak -- unless you're a vegetarian or an eco-freak. In the same way, you won't spend $800 on a half-baked Android tablet -- you'll buy an iPad -- unless, of course, you're an Apple-hater or an open-source freak :)
Until Android tablets become dirt cheap or the user experience improves significantly (including a decent market where everything works on every machine), only the vegetarian eco-freaks amongst us will be asking the question in the article!