Also IMO the dev tooling is better for OCaml. Far better compile times.
A big part of interacting with APIs (which I imagine Stategraph does) is just dealing with records, and working with records in Haskell is really annoying unless you bring in lenses which bring a lot of complexity.
Tooling was kind of bad previously. But dune has got really good. I like the new dune developer preview thing that is still in beta.
https://preview.dune.build/
Wow that looks slick!