I think it's probably more of a consequence of the long long discussions that were had at https://github.com/erlang/otp/pull/960 -- with 15 participants from the OTP team, regular Erlangers, and I'm sure a few Elixir people too.
My idea here is not to remove merit from Elixir in helping the ecosystem, but in pointing out that the Erlang community itself is expanding on these ideas of involvement and a more open design.