[agentultra]

Not the author but I've had similar experiences. I haven't used Haskell or OCaml in my day job (though I would like to if given the opportunity). I have written some trivial and slightly serious programs in both of these languages. I've even worked up a few small programs in Agda.

Elm, IMHO, is in a class of its own. There's a strong focus in the design of the language to be usable and friendly to the developer. The focus on structural typing, the error messages, and the tooling all go a long way to bring the developer from beginner to expert with as little friction as possible.

In contrast I find this is the biggest hurdle for Haskell and OCaml. It's simple enough in either language to get started but there's a steep learning curve to becoming productive and the tooling, documentation, and even the design of the prelude libraries are the largest stumbling blocks for transitioning from an intermediate developer to an advanced one.

update: grammar