Fault tolerance and supervision hierarchy might be unnecessary as mentioned.

Hotloading capabilities are unnecessary, most shops go with blue-green deployments, so the hotcode loading is usually unused (and for a good reason, so much complexity!). Distributed computing also goes unnecessary as most applications are deployed with containers with some form of autoscaling, so the industry went a different direction than elixir.

That leaves us with runtime introspection, which is pretty cool indeed. But that has to compete with Rust performance.

Pretty tough.

I love elixir, but when Go got premptive scheduler for goroutine, the need for elixir dropped dramatically. Which is sad because i loved the language and phoenix.

I'm hoping it makes a comeback, though!