Elixir is hard to write (well) and hard to hire for because it lacks the network effect.

The ruby community it aimed at initially already moved to go and JavaScript by the time phoenix became production ready.

Erlang is an arcane, hard to understand language which many of the base packages of the elixir ecosystem uses.

I think that’s why it’s not as popular as it should be.

It’s great though. My go to stack is phoenix nowadays.