I think you're missing the point. We use Elixir to solve one class of problems which its excellent in doing (notably: real time distributed systems.) In this area, there is nothing even remotely close in terms of capability. So, we choose the runtime over the language (elixir is a pretty cool dynamic language though!). Also, due to the unique nature of Erlang/Elixir, a lot of problems that exist in C/C++/Rust/Go don't exist in that language. Of course this has meant writing a lot more tests to test things that a typechecker should be able to catch. But it is what it is. We're following Gleam though to see where that ends up.

BTW, here's some places I've spoken about Discord's Elixir usage:

- a podcast: https://smartlogic.io/podcast/elixir-wizards/s5e8-nowack-hei...

- interview with José Valim (elixir's creator): https://elixir-lang.org/blog/2020/10/08/real-time-communicat...