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Am I misunderstanding something, I think that gesture exists on iOS?

Swiping from the left screen edge to the right navigates back in any properly designed app.

Alternatively sheets are usually dismissed by swiping down.

Do you have particular apps or contexts in mind where this did not work?

On iOS it's app dependant, it might work or not. On Android, swiping left guarantees a going back event sent from the OS, it'll always 100% work.

Except if the gesture recognition is bad, which it has always been on the phones I’ve used it with. But maybe it improved recently.

90% of apps (that don’t override the default UINavigationController behavior or use some custom cross-platform framework) support the back swipe gesture.

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