My biggest issue with Elixir right now is that in order to take advantage of its main selling points (process model, concurrency, etc), your running application

My biggest issue with Elixir right now is that in order to take advantage of its main selling points (process model, concurrency, etc), your running applications are essentially stateful. This adds some complexity to the way it is run, especially if the server load is highly dynamic, and you need to scale up and down instances every few hours. This means deployment and running a production elixir app is fundamentally "different", which leads to people reaching for hot code swapping, treating servers as "pet" instead of "livestock", etc. With tools like Kubernetes and containers taking over more and more of the ops world, running an Elixir application feels like swimming against the current as the BEAM VM have its own clustering system that requires some workaround to make it work well with an elastic auto-scaling cluster.