I’ve seen ex python or node.js developers say they are just as productive in Rust.

After a few years of Rust experience, it still pales in comparison to Erlang productivity for me.

I'm really looking forward for Hamler lang to become mature and popular https://github.com/hamler-lang/hamler

It's based on PureScript, which has a great reputation, but adds all the benefits of Erlang.

There's a few neat projects moving in this direction: