The n900 had a _tiny_ keyboard. But it was practical to type are almost normal keyboard speeds. Unlike on a touch screen, where auto correct gets in the way.
Even without autocorrect (say, with Hacker's Keyboard on Termux), I still get frustrated by mistyped keys. "Up arrow" instead of space in bash, "o" instead of "p" in org-mode (with speed-commands).
I miss my N900 physical keyboard.