The "scheme inside" might be missing the mark in any number of features, but in the end the resulting effect it had have been profoundly, well, effective. It's there.

People have been going all SICP (Abelson/Sussman) on JS ever since Crockford exposed the hidden scheme (or hidden not-scheme-at-all, if you insist) and moved JS far, far away from the humble prototype OOP it started as. And that had little to do with any language extensions that had been creeping in very slowly given the lowest common denominator nature of web development, and everything with the funky scope binding tricks that generations of programmers had been taught in the memorable "let's make Scheme OOP" drills of SICP and the MIT course (that so many other universities based their teaching on)