[bluehatbrit]

I use Elixir as my primary language in my day job and I'd say it's a mix of the community and the ecosystem. Most modules seem to have great documentation, so if you're producing one you also put in the effort. However, ExDoc (the documentation module) is also really solid with loads of great features, including the ability to run your examples as unit tests.

That said, it's not all that uncommon to be searching for something like an implementation of a SaaS API and find a totally undocumented module. It's not the norm by any stretch though.