The reason I have the breakdown is to make it easier to sort and filter worlds without having to parse the UWP or some kind of ugly regex. This XML doc is really just a database of worlds.
If anything the UWP could be removed.
I agree that the breakdown should be on the same level as the UWP, and that the UWP can even be optional. I've used it many times to filter out worlds... if you've ever looked for "that perfect world" that meets a range of criteria, nothing helps like a regex on the UWP.