I just read and enjoyed this:
I’ve been using Kindles on and off ever since they launched. Our relationship has been contentious but I’ve always been seduced or re-seduced by their potential. At their best, they are beautiful devices. At their worst, infuriating. They are always so close to being better than they are.
I’m a big fan of my Kindle Paperwhite, but I would like it a lot better if it had hardware buttons for page turning. There are a number of interesting observations regarding the UI design implications of the Kindle as a single purpose device for reading (in comparison to multi-purpose smartphones or tablets) in here as well:
When is a generic hardware bucket great? When the objects placed into it are unpredictable. And more so when the purpose of the objects is unpredictable. Hardware buttons inextricably tie you to a specific interaction model. So for the iPhone to be a flexible container into which anything can be poured it makes most sense to have (almost) no hardware controls.