I'm very interested in getting rid of "Files" and making programs use/manipulate databases more, but the issue of sharing things has always been a problem. Like

I'm very interested in getting rid of "Files" and making programs use/manipulate databases more, but the issue of sharing things has always been a problem. Like you say in Android, but also iOS, it's annoying. However, you've given me the idea of what if instead of registering to handle a file type and giving the user a way to select a file we made sharing better by making applications provide a kind of "Files" view in to their data which may simply be items in their databases. On iOS the app ShellFish provides a seamless view to the files on my servers inside of the Files app and the Files picker of the OS. In macOS the finder's file picker has a section for Photos which lets you select a photo without needing to export it to a specific file. We could instead select from applications on our system instead of going to each application and sharing each piece of data we need.