Erlang's strength is in its virtual machine which has supervision trees built-in, a built-in DNS system, built-in inter-node RPC, hot code reloading, massive co

Erlang's strength is in its virtual machine which has supervision trees built-in, a built-in DNS system, built-in inter-node RPC, hot code reloading, massive concurrency, etc... I still haven't experienced a programming environment that replicates the Erlang/OTP environment. Period. Haskell is amazing, I've built my company on it, but we're also building our company on Erlang - Haskell's tooling around distributed computing is much more immature than Erlang's (although Haskell's concurrency primitives and STM libraries are extremely mature and arguably better than Erlang's actor model).