Some languages—Clojure is a good example—have packages from 10 years ago, entirely unmaintained, that still work great because no maintenance is needed.
In my experience, Elixir is very much on that end of the spectrum as well. I'm wondering if GGP just considers packages that don't have updates for 6 months as "unmaintained" or "dead" because they come from Javascript world where everything is, well... you know.
Some languages—Clojure is a good example—have packages from 10 years ago, entirely unmaintained, that still work great because no maintenance is needed.