I'd like to be able to know what screen my user was on previously when they arrive on a screen.
This is especially important when a screen may have two or more entry points. I would love to simply say "After you do... go back to the screen you came from" - with minimal code on my part.
I know you achieve this through variables/collections today, but I think PowerApps should be able to tell me through a property like App.PreviousScreen or something.
Bonus: a History array/collection that could be accessed for really complex apps that could be used to build a bread crumb trail/navigation.