Key word is "permissions", right? Meaning apps that don't wish to scare users with permissions will adopt the new API, but existing filesystem access should continue to function. Otherwise this would be crippling to some users and apps and I doubt it would go over well.
That sounds like the right way to do it. I would love a file browser that has no network permissions but special file permissions, and my network capable apps to have no extra file permissions beyond their own needs.
They are crippling it some way I am a heavy user of calibre companion app on Android. A library type app that you use to open books in the readers of your choice. But according to the dev of calibre companion opening the book into a reader of your choice will break
