I think the two things Elm lacks the most right now are some form of polymorphism and some way to make parts of an Elm application manage their local state. At

I think the two things Elm lacks the most right now are some form of polymorphism and some way to make parts of an Elm application manage their local state. At the moment there's only an internal API for the latter, and it's pretty ugly. I think what would be good for Elm would be to spin up a few separate Elm processes and provide an easy interface to make them communicate, sort of like in Erlang. You can do this using ports and binding them together with js right now, but it's kind of ugly.