I really hope Apple can introduce a toggle to hide app folders in Document Picker and the iCloud Drive App. Even being hidden from the list, apps with Document Picker support at best can still use its synced app folder for private or "unsaved" documents, and file aliases (iWork *cough*) that act as a list of recent documents out of its container. As for the upside, your document picker is no longer flooded by app folders, which once flushed away the real folders you created by contexts or projects at the drive's root. Together with Open In Place, it would finally deliver Finder-like experience, yet simpler, with proper placeholder support & inter-app file access. Feedbacks filed anyway. Hope that more iCloud Drive users would file one too.