[jre]

The smartphone app-centric OS is fine for the use case where you only work with one application.

But I don't see how it can work if you need to use multiple applications to work on multiple projects. In a typical professional use case, you want to keep your files organized by project, so the files/folder approach is pretty good.

Now, files/folder can probably be improved. (Semi-)Automatic tagging can be improved. Search can be improved. Maybe we need more than one parent per folder. But please, let me organize my work per project and not per app.