However for production code I only use the programming languages directly supported by platform owners.
Of course others rather take part in ramping up eco-systems and that is fine as well, otherwise we wouldn't get new toys adopted by platform owners.
Out of all of the languages I've read about the past few years, only 3 jumped out as bringing real value to the table compared to the other options that are already out there: Go, Rust and Elixir.
Fundamentally though, Erlang/Elixir is a language built from first principles to achieve reliability in concurrent, distributed contexts. It's quite unique in that regard. Even the language it's most directly compared to (Go, in having go channels that are sort of but not quite like Erlang/Elixir processes) is built instead from concurrency first, not reliability (and having concurrency flow out from that as a required feature).