Frankly, this is a very good example why I inevitably give up on using Debian. It is not the software writers' fault that your distro can't be arsed to keep its package system up-to-date. Even the unstable branch is routinely multiple versions behind on software. The idea of linking end-user software versioning to the operating system version itself was always a dumb idea, but has become even more absurd over time. N…
Maybe distros like Debian are more stability/security oriented than feature oriented. New version of software often contain new features that it may introduce new bugs. Debian guarantees that when you install their distro things are going to work and are kind of secure. The tradeoff of having all the software in the distro being checked by people that have tested and checked that everything works well and smooth it's…
New versions of software also fix old stability and security bugs.
If software became more secure with age, then the older your version of gnome screensaver, the more secure it would be ( https://www.jwz.org/blog/2015/04/i-told-you-so-again/ ).