That's very true. And this is the very reason why tablets and smartphones are so popular - most people need only a screen with the Internet access to consume content, but those who produce the content will still need a bigger device.
I actually noticed this story on my phone during a movie break last night but waited to read it until I could get on my PC (running Ubuntu BTW) so I could read it more comfortably.
Further, I dislike the touch interface of phones. I may connect a mouse to it so I can see if it's more usable. Then I'd need a Bluetooth keyboard too of course. And since my older eyes strain a bit with the tiny screen I'll probably get a SlimPort so I can read the screen on my regular monitor. Wait! My phone is now a PC!!
There is data that indicates that even filling out longer pieces of text and forms is on the rise. places like Plenty of Fish has real data about who is willing to fill out forms with a mobile devices and the numbers were surprising (to me at least)
Similarly after that article was published, I saw the analytics of a large university and could see the amount of mobile use increasing (thought not as dramatically as POF) with tasks as complex as filling out a college application.
In the end, I'm surprised, but yes, people fill out dating profiles, college applications, and even Hacker News comments from mobile devices more and more.