This is my favourite stack here by far. What are your pain points?
Haskell and Elm both work great, but I can imagine in future using something like Haste or PureScript Bridge; it'd be nice to work with both the backend and UI as a single project. Not a pain currently, but this is a nice to have.
Biggest pain is documentation. Haskell stuff is documented, but more hand-holdy examples would be ideal. OTOH, some language communities have a culture of writing documentation that is too hand-holdy, flooded with emojis, and is generally frustratingly infantilising. I'd like Haskell to strike a balance between the two. I'm optimistic we'll get there eventually.