Correct me if I'm wrong but a big part of the value proposition these days for Erlang/Elixir would be that it comes build in with a lot of the tools that other runtimes would require.
For example a message bus is kinda integrated in the BEAM runtime or Erlang, while most other runtimes would have to use something like Kafka or AWS SQS etc. Or caching and some other things. Of course I'm not sure how good all the inbuilt solutions are compared to dedicated tools, overall or usually IMHO I prefer dedicated tools as opposed to all in one as the dedicated tools/services usually are more flexible. On the other hand of course it is also much overhead.