What you say is true if you restrict the term usability to just mean user interface design, but usability can go far beyond that. Usability should be about how

What you say is true if you restrict the term usability to just mean user interface design, but usability can go far beyond that. Usability should be about how your product solves a problem, not just how its options and menus are laid out. As soon as you hear about how Dropbox works you know instantly that it's far more usable than other sync options.