The initial paragraph wasn't too clear, but the comments on the End of
Life SuSE release in http://lwn.net/Articles/263153/ explain the
conundrums and illusion of desktop support, with just security updates,
3rd parties may not release fixed binaries which will work.
I think the Gentoo updates (as well as Debian) will work better done
regularly, simply because that's what the updates are tested with. A
new "Release" causes much more trouble, because it has to support the full
system upgrade, between high impact changes. Frankly even just tracking
security patches in more traditional update models, it's wise to check
them out on "sacrificial" systems.