check this out:

https://www.youtube.com/watch?v=feAW1AVzNwo

But also there are GUIs (I believe there are wx bindings) that are shipped with erlang (wobserver for example)

By and large, though people are writing servers in erlang, so building GUIs has never been a priority, and by the time erlang got a kick in butt in popularity due to Elixir, the way to write a GUI in erlang, became "write a web interface in Elixir".

Finally don't necessarily trust stackoverflow; the entire elixir community has basically left SO and gone to elixir-specific fora, which we think is why elixir dropped off the SO developer's survey.