I completely agree with you. I own an iPhone but I'm basically the tech support person in my home and had to learn Android and I do not understand the universal back button at all and I find it more unpredictable.I know what you are talking about, Im saying the 2nd one is bad design and provides an inconsistent experience. That’s why iOS uses the 1st option
I feel like the back button should only be to undo the last action within the app and nothing outside of it. On iOS, if I want to go back to the last app I simply swipe the bottom of the navigation bar or go to the app switcher. There is even a button at the top that allows you to go back to the last app if you opened a link that took you to another app. I feel like all of those options are more deliberate than having a blank back button that you aren't sure what it's going to do.
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