This isn't true for smartphones anymore. Touchscreen keyboards provide much more data that can be used for autocorrect. Also, you can't swipe type on a keyboard.
> Touchscreen keyboards provide much more data that can be used for autocorrect.
My spelling mistakes are either from muscle memory hitting an incorrect sequence of characters, transposing letters, or from me not knowing how to spell a word. How is a touchscreen going to improve any of those problems?