Buttons do not require me to lift-travel-place-hope that was enough pressure to turn the page but not to smudge the screen-lift-travel-replace my thumb for every page turn. Pressing a button I already have rested my thumb on (as with my old kindle keyboard) is a much more mindless operation. It may not seem like a lot, but it does matter to me. It makes for a more immersive reading experience.
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