To me, not having to hit the home button, swipe, enter pin, find app, tap app, wait for an animation all before I can do anything the app is supposed to do, and then have to do most of that all over again if I don't touch it for a minute, is an excellent reason for a purpose-built device. Also, fucking buttons. I love buttons. Touch screens are awful.
Also, EFF is on option for smile.amazon.com. I've generated $9 for them so far, would have been more if I had remembered to use smile more often. Amazon is nice enough to remind me once in a while to use it, I wish it would just be automatic when I'm logged in, I refuse to install a plug in for that feature.