The thing is : it isn't an "idea" at all. These projects ended up with a big lock, or not tolerating reentrancy due to history -- they were developed at a time, and in an environment where there were no threads (or where support for threads wasn't of interest to the developer). It's just a bug. Not an idea, not a benefit. All the talk of it being the best way is nonsense invented after the fact to try to justify something that's just broken.

I'm an Erlang practitioner since 2007 and I approve this message ;)

Learn Elixir or Erlang and show that there's an alternative to Node.js that's both fun and powerful - and battle tested.

Ya, my next green field project will definitely use something actor or CSP flavored. Maybe clojure based, more likely Elixir or equiv.