The Symbian UI was extremely clunky. I am not sure it even had touch screen. They had whole keyboard, but you had to navigate menus with arrow keys. Why not give user the full power of the keyboard, like Emacs or Vim? Why can't I have menu options on hotkeys?
I think people forgot about how bad phone UIs were before Steve Jobs' heavy focus on UI. And I am no fan of touch-based controls, still want a proper keyboard.