> If you do so much IPC that you have to design your language around it you're probably doing it wrong...

I'm gonna have to disagree with this. Often when languages add features to their core, it allows for a very different (and often better) approach to writing code. Think Lisp with first class functions, or Rust with the borrow checker. Why should concurrency be any different? This feels like a Blub moment and I would highly recommend you give erlang or elixir a try, just to see what it is about.