[centimeter]

Why not just use Haskell? You don't get OTP/Beam, but the GHC runtime provides almost all the same functionality (plus a lot more), to the point where the Cloud Haskell library is basically a full clone of Erlang's actor functionality.

[nine_k]

Does it provide all of the OTP? Can you write in the "let it fail" style and be certain that the failing parts will be restarted, etc?

Also, BEAM is somehow more battle-tested.