I've noticed that
1) fedora-workstation-repositories is not installed by default on F27
2) After installing this package, there's no indication it's there in the gnome-software UI (even after killing the process and running pkcon refresh)

My understanding is that this is supposed to enable user to install 3rd party stuff easily, currently just PyCharm or Google Chrome, and that gnome-software is supposed to display these (when the package is installed) and allow the user to install them with just a click (warning them that this is 3rd party software not supported by Fedora).

Did I understand the feature correctly?
Is the reason it's not installed by default is because the UI doesn't know how to deal with it, or is this a bug?