There are several reason why web applications should not be packaged along with the server that is expected to serve them. For one not all organisations use vanilla tomcat. There are other reasons I won't go into.
I'm filing this bug because some of our builds failed in trying to download the tomcat.tar.gz file. We then had to manually wget the file and place it in downloads/ to make the build pass. I suspect the download failed because of an overloaded server (Frankly, I don't really know). If someone has ideas, please share them.