I respect Steve's insight, and consider him a visionary. However, this "test" seems uneven and a bit biased.
The biggest alarm was the speed of texting on the iPhone. I've proven Nokia's flavor of T9 to be faster on various phones against any mini QWERTY device, especially a haptic free iPhone, and explained the results anatomically and logically. There is a long list of victims that lost $20 wagering against my proficiency with T9. For objectivity, there was also an article similar to this with nearly the opposite results, though I forget exactly who wrote it. So I'm stunned and curious as to how your test drew such opposing results.
I'm a mobilist, and only use desktop computers in emergency situations. My primary device is a Nokia N95 8gb. I compose all of my forum posts and articles on Symbian-Freak and PhoneReport on my device while walking my 78 lb. pit bull, including the long-winded open letter to the Nseries director featuring drawings of my Nokia N-XT concept device design. I rarely experience fatigue, and only type with one thumb. I'm ambidextrous with T9, but primarily use my right thumb.
I will assume your scores were abnormal because you prefer QWERTY, primarily use it in full size desktop devices or handhelds, and hardly have much experience with T9. It is proven in my real life usage that one thumb is faster using 12 keys than 2 and 33-40 keys. It requires less hands, no need to look at the screen or keypad with a few exceptions.
Instead of trying to add words to the limited T9 spelling list, spell words in syllabic pieces, for instance "Not-ting-ham" for Nottingham, and save those dictionary listings for regularly used words.
On a desktop QWERTY board,I type around 60 wpm, and around 30 on mini QWERTY, but closer to 45 on T9. It requires familiarity patience, but its well superior.
For more in depth conversation, contact me at [email][email protected][/email] or [email][email protected][/email].