I don't want to write code in a browser. For python you have something like ipython which allows you to have an interactive experience, while also allowing you to have your favourite editing environment. For ocaml, surely there are also repls that provide this kind of thing.
I'm a bit surprised to see no mention of Owl (https://github.com/owlbarn/owl an older project for scientific computing in OCaml that was resurrected recently), I wonder how they compare.
The Raven README mentions:
> We prioritize developer experience and seamless integration.
so maybe that's one difference — I used Owl on a course project about a decade ago, and while it got the job done, I remember the experience being rather painful compared to Numpy (even though I was more experienced with OCaml than with Python at the time).
OCaml seems to be a lovely language based on my limited experience with it. It’s a pity it’s not more popular.