Ports are generally great, but you are running multiple apps and communicating between them using STDIN/STDOUT etc. There are certain corner cases where they might not be suitable. I had been using an OPCUA library where the logging had to be turned off because otherwise it was sending the logs back to our Elixir app and we were expecting Elixir terms. Also the shutdown of the remote end of a port can stop the data getting back to Elixir. There are ways around all of this but it's slightly annoying. In general though, ports work 80% of the time and are really convenient.
