>This one is controversial, but I think a visible always available back button is a huge accessibility win even if it's sometimes inconsistant in behaviour.
As a recent iPhone switcher I can't stand the "back" behavior. I was so happy to discover the swipe right to go back feature until I realized that it didn't apply to images and other full screen elements (where there's an "x" instead of "<back" in the top left corner). For those you swipe up to dismiss. So now I have to keep mental state for what type of content is currently displayed to know how to get back to where I was. This is more annoying than Android's inconsistent back button experience IMO.
As a recent iPhone switcher I can't stand the "back" behavior. I was so happy to discover the swipe right to go back feature until I realized that it didn't apply to images and other full screen elements (where there's an "x" instead of "<back" in the top left corner). For those you swipe up to dismiss. So now I have to keep mental state for what type of content is currently displayed to know how to get back to where I was. This is more annoying than Android's inconsistent back button experience IMO.