If everything works so well, how is it, then, that the bugs and troubles Ubuntu's user-base generate so few upstream patches? At least in those plumbing packages. Is it because they don't fix problems or because they don't forward fixes upstream?
A I pointed out elsewhere in this thread: I don't think Ubuntu is required by some ethical standards to contribute. It should make sense for Ubuntu for economical reasons to do so. While I appreciate RedHat, Novell and others, I don't suppose they employ so many developers just for the PR value.