App design: Swiping versus tapping

From Ryan Hoover‘s analysis of why dating app Tinder took off:

Tinder demands very little of the brain. It reduces cognitive overhead into a binary decision: swipe left (not interested) or swipe right (interested)… Tinder’s swiping mechanic is not dissimilar from the ever-present infinite scroll, popularized by Pinterest. What makes it so addictive? Both interactions – scrolling and swiping – require less effort than tapping or clicking a button… It’s not unusual for Tinder users to swipe through more than 100 profiles in a single session. Each swipe delivers immediate gratification, resolving the mystery of who will appear next.

Ryan says that scrolling and swiping require less effort than tapping. He’s right, but why is that?

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