I'll tell you what, that backlink is a pain to use. The touch target area for it is far too small. Touch targets in iOS are way too small, generally. For example, the new Apple Music app is filled with those 3 dot menus, and again, touches are far too often not registered. You have to be incredibly precise with your touches.
The back button is one of my favourite features in Android, and I'm glad that Apple has decided to add it to iOS. However, the implementation is nowhere near as good as Android’s. Having to reach for the top left of my giant 5.5" iPhone 6+ every time I want to go back is just annoying.