Interesting point that lack of back button contributes to iOS apps being better. I realize there are many reasons why that's the case, but I certainly have not had to extricate myself from sub-menus to the extent I have in (highly-rated!) Play store apps.

I went from iOS to Android and back again and really miss the back button, but I'm finding myself mostly wanting to use it to close apps, which of course the home button does. It would be nice to have a software accessibility back button to float in the bottom right of the screen similar to the accessibility home button that would close open menus etc before exiting if possible.