> - local and remote calls behave the same in Erlang/Elixir, allowing to start with a monorepo having different Erlang "apps" than run on the same node, but then running the different apps on different nodes in the future, once the application, scales. This can be done very little changes to the application.

I wouldn't really say they behave the same. They have the same interface, so it doesn't take much to send to a remote node vs the local node, but there are a lot of details in the behavior that are clearly different, as is the nature of the beast. With a local process, if you monitor it, and receive a kill signal, you know it's dead; with a remote process, you may get a process died signal or a connection died signal; if the connection died you can't know if the remote process is dead or alive. That's new behavior and can be tricky sometimes.