If what you have is fine and works, why want new software? And if you want more frequent updates, you can (a) use a faster-moving branch, which BTW Debian and Ubuntu have; or (b) switch to an OS that provides you with more recent software, e.g. Arch Linux, Manjaro, Gentoo (? not that sure about this last one). Declaring sth. stable takes time, especially if you also incorporate new stuff into it. Even after five years of development, Debian and Ubuntu release patches, because of errata in their releases.
But if you want secure, stable OS that wont drop the eggs, and also rolling release, well, nobody can do anything about it.
That's OK. Nobody has an objection that you do it that way. It's just that there are acceptable flaws and shortcomings for some use cases, and some OSs care more about those.
But if you want secure, stable OS that wont drop the eggs, and also rolling release, well, nobody can do anything about it.