[adeon]

I think you are pretty spot on here. I write Rust and Haskell most of the time, where the choice depends on the kind of project I'm working on. Also I've written Rust professionally but Haskell has been confined to random hobby projects.

I love Haskell but it has its own flavor of problems. I've meant to brush up a bit on OCaml; I've heard it has interesting features in its module system that Haskell does not have (maybe what you call "higher order modules").

[ChadNauseam]

Yup. Professional OCaml dev here, higher order modules are pretty cool. But OCaml shows its age and without typeclasses I don't find it very pleasant to program in. Most days I'd rather use Rust to be honest.