That's kind of like saying "ANOTHER linux distro?". One of the key ideas behind FOSS is the element of choice. If a dev-team thinks they can put out a better package manager or window manager or filesystem or , let 'em. If it turns out to be better, then everyone benefits from an improved user experience, or in some cases, an easier API to build on.
If it turns out the software isn't so good, we may still benefit from it by learning from their mistakes, or even taking the good portions of the software and applying them to other projects. So long as someone is attempting to do something new, benefits will eventually come.