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That’s a good point, but I’m thinking that any other action to activate it would either be unintuitive or too easily activated by accident.

The very best option for people would be to allow us to chose which gestures/actions do what. But I doubt that happens anytime soon.

Maybe 3D Touch and swipe down on the edge?
 
for those who use reachability often, use the on screen home button, and you can place it right at your thump, so you dont have to reach bottom like on 6-8 iphones
 
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