I love that the Erlang guys seem to be so open to Elixir being a big part of their ecosystem even relying on ExDoc for their new documentation system (I think everyone can see it's a big improvement over the brutalist UI that was there before). A lot of software projects would be ego driven rather than pragmatic on something like this.
ExDoc is arguably one of the nicest documentation systems out there, and Erlang moving to it means two things:
1. The Erlang devs do not need to implement and maintain their own anymore.
2. ExDoc will improve faster since people previously working on Erlang’s documentation system shift to it.