> The JS ecosystem is not that old

I hate to tell ya this... LiveScript was renamed to JavaScript in 1995, and the first ECMAScript standard was published in 1997. So not 40 years old, but 31 years old.

NodeJS (liberating JavaScript from the browser) was first released in 2009... so again, not 40 years old, but old enough to have a drivers license.

I agree with you on the other side though: despite the language being relatively old and stable, it feels like the wheel's getting reinvented over and over again and "this will be a good enough pattern for the next decade" hasn't ever really shaken out, unlike Lisp or even Python.