JavaScript is from 1996, it's 25 years old, and apps built with it are used by billions. With regards to the backend, it has a vibrant full stack ecosystem, it's performant, simple, and easy to hire talent for.

It's okay not to enjoy JavaScript (I'd always prefer to go with Dart or Rust myself), it's okay thinking that other languages (and ecosystems) are better equipped to solve some problems, but calling it unproven and exotic is very surprising to me.