There are plenty of companies using erlang in production. The community is relatively small and almost everyone knows each other. Yes, you can find erlang jobs or elixir jobs - a lot of those these days (PM me if you are looking)

Besides, erlang definitely gives you new perspective in building large scale system; supervision tree (let it crash), the actor concept, message passing, preemptive vm, built-in distributed erlang nodes, the repl, hot code swapping - any much more

The power comes from the whole ecosystem. Concurrency is built from ground up on language & vm level.