Stableness of interfaces is supposed to imply the software version is still maintained though. E.g. how stable kernel versions get backports of fixes from newer versions without introducing major changes from the newer versions. It's not meant to mean you e.g. get an old version of the kernel which accumulates known bugs and security issues. If you want the latter you can get that on any distro, just disable updates.

I'm sure the volunteers working on this stuff is doing the best they can, but stuff like this isn't usually "sexy" enough to attract a ton of attention and care, compared to other "fun" FOSS work.