OpenBSD doesn't even have that: if you don't reboot quickly after installing a major upgrade you're going to have a bad time
whereas you can run ancient userland on more modern Linux kernels (as evidenced by the container ecosystem)
Other core components that makes up most Linux distros (e.g. libc, gtk, libc, curl, ssl etc) however do not.
that's interesting, can you share bit more details/links?
That was the joke, friend.
