[dgb23]

Some of the most loved languages like Elixir, Clojure and Rust are fairly modern and powerful and fun to use. But they are also scary. Elixir and Clojure are functional languages, Elixir runs on a niche runtime, Clojure is a Lisp and looks foreign to people who are used to more common syntax, Rust has functional concepts baked in and is known to be hard to learn initially.

Unfamiliar + hard to learn = scary. Which leads to less overall popularity when it comes to actual jobs.