[ytdtty]

Yes! Just look at the code required to serialize objects, send them between 2 computers, and deserialize them. You would need to do all of that stuff manually. Even with a library like AKKA, I don't think it's nearly as simple as it is in Erlang: 1 line to connect, 1 line to do the remote call.

In Erlang you can remote into servers, examine their message queues, update the running processes with new functions, etc. You can guess what that would take with those other languages.

You could roll your own supervisor process and have things automatically restarted when you lose connection to them in the other languages, but it's already baked into Erlang.