Thanks for the article! I find it really surprising how difficult it is to deploy Elixir apps when it's so much more popular now and the Elixir team is so great at the developer experience.
Deployment and configuration is among the top priorities from both the core team and the community from what I can tell. There's been a lot of discussion about it and some resources being dedicated in the last year. So only a matter of time, but a little heavy on initial deployment for sure.
In case you haven't heard yet, there's ongoing work [1] from Paul Schoenfelder for just that! Dockyard (employer of Chris McCord, father of the Phoenix framework) hired him some time back for this very reason.