OSes designed in the 70s aren&#x27;t and weren&#x27;t necessarily bad. It just depends on the circumstances. When they were written they fit the times quite well. But things have changed since then.<p>Lisps have also changed since it was first created. Unlike many languages lisp has evolved tremendously over the years and has benefited from a tons of language research. The lisps we have today are much more than we had in the 60s.