My main interest these days is writing non-blocking GUIs. I don't want to see a "spinning beach ball" or "no results found" or similar things ever.

In theory Erlang has the best non-blocking support of any language, but I see a lot of risk in developing prototypes to get to the point where I know it was a good decision.

I don't see Elixir as moving the needle so far as what is conceptually tricky about Erlang.