One of the weaknesses of Javascript is its absolutely terrible standard library. In comparison to languages with solid, comprehensive, "batteries-included" standard libraries, you spend a lot of time re-implementing basic functionality. Or you import jQuery, or LoDash, or underscore, or use pieces of Ember or Angular, or React, etc, etc. Or some bastard abomination of all of those.
I'd argue that's a strength. Note how scala is modularizing its standard lib in Dotty, and TypeScript is doing that same for stdlib typings.
Standard libs are great, but they need to be modular. If they're modular then they are versioned separately from the language, and at that point there's no difference between a well specified and maintained lib (eg lodash) and a stdlib.
