Xubuntu 12.04 LTS has three years support, everything else apart from LTS releases, at this point, has eighteen months. Not rolling release. While the advice might be good for security, it is a strange way of going about it and expect (regular) breakages if you are living on the bleeding edge. If you want something stable use an LTS and tweak security settings as needed (as I say, behind a router is pretty safe). And read the link I posted earlier.