Not sure what you mean by "parallel flows of data", but Erlang/Elixir isn't particularly good at handling multiple streams of data between distributed nodes if

Not sure what you mean by "parallel flows of data", but Erlang/Elixir isn't particularly good at handling multiple streams of data between distributed nodes if you're relying on the built-in distribution subsystem (net_kernel). Only a single TCP connection is opened between any two nodes and there's a head-of-line blocking issue with message delivery (intentionally for backward-compatibility reasons). Certainly you can build your own multi-connection subsystem if you want to, but that's true of almost anything. I've had to do this for Erlang several times.