[SomeHacker44]

Common Lisp has moved forward exactly zero "officially" for decades. Yet, modern CL implementations are largely compatible with one another, largely interoperable with modern multicore hardware and multithreaded operating systems, largely capable of using Unicode and other representation formats, etc.

Of course, CL was designed with "extending CL" as a feature, and not locking the CL user into CL as it is "today." Shame so few other languages bother with this (Java and Clojure on the JVM come to mind immediately as hard to extend). Other languages have very active language evolution (Haskell/GHC comes to mind).

I like my languages to evolve. Preferably not the way Java did (I still hate the 1.5 type erasure hack).