Fair enough to advocate for your project, which I btw find it very nice.

However, xml configuration is really a weak argument. It is very rare that anyone needs to touch the XML files. In fact, when someone touches those files is normally due to either a very extreme case or more commonly lack of interest in learning how the admin UI works. Jenkins lets you manage absolutely everything from the UI, from the very beginning, which is pretty convention-over-configurationish. Also Jenkins' changes control system lets you track and diff every change very quickly.