iOS is kinda a mess when it comes to what's easy for people who hold their phones in their left versus right hands. That back button is definitely for left-handers, but then the control center is clearly better for right-handers. The slide-from-screen-edge-to-go-back gesture is only usable in the left hand, and the slide-from-screen-edge-to-go-forward gesture is only usable with the right hand. My conclusion is that iOS is only really designed to be used with both hands gripping the edges of the phone, which meshes with their ever-increasing screen sizes. The new Pro Max is 6.9"!! That's basically a tablet.
