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Some people read music on an ebook display -- having a foot pedal to advance the page while your playing is a relatively common thing.

Treadmill is a big one. Or under covers in bed with the Kindle propped up or mounted.

My wife, and nearly all of her friends have one. They setup the kindle with a mount and lay back on the bed or couch.

It's nice having a physical button, touchscreen isn't as ergo or reliable

Absolutely but buttons on the device itself are far more useful than this.

Touch screens are tricky for some people with motor control issues.