I agree with the authors argument. The physical buttons is why I still haven't upgraded my Kindle 4. But one interface is unlikely to be the best fit for everyb

I agree with the authors argument. The physical buttons is why I still haven't upgraded my Kindle 4. But one interface is unlikely to be the best fit for everybody. Older gadgets and programs exposed more settings - either through UI and access to the system files. Many cheap phones even had themes - something now impossible without root on the Android phones. The power users could improve productivity or appearance. It often came at the cost of less polished design for some settings and higher UI complexity. My ideal next Kindle would come with hardware buttons and touch screen controls that have good defaults for the average user and can be configured.