The thing about physical buttons is that they make more sense on an e-reader than a tablet. It's not an input-heavy device, it doesn't need such a versatile in

The thing about physical buttons is that they make more sense on an e-reader than a tablet. It's not an input-heavy device, it doesn't need such a versatile input mechanism. It's primarily an output device, and the design should reflect that. Use buttons, which aren't as versatile as a touch screen, and keep the actual screen clean.