Thumbtext is critical in order to efficiently communicate with someone when trying to type words on a keypad that uses 8 keys to sum up the entire alphabet.
When you're driving on the freeway, there just isn't time to type out all the letters of every word. Thumbtext is the solution.
An even more time-efficient way to communicate is to use that keypad's numeric characters to enter a person's phone number then hit the TALK/SEND key.
wtf r u doin
txt me 2nite
Text Message Sent: Dude, I can't understand that stupid-ass thumbtext.