I'm reading through Joe Armstrong's thesis on Erlang, and one of his main points is that concurrency programming shouldn't need to care about locality, at least in terms of correctness. Processes can run locally, or on separate machines, because each process is isolated as if it's its own VM. Containerizing it just makes for simpler deployment units, in my view.

That said, there might be some pragmatic tradeoffs eventually made for the Erlang VM that I'm not familiar with yet that makes the container move more dubitable.