Reason compiles to Ocaml, yes. Does Facebook actually want you to just use Ocaml? Sure doesn't seem that way to me. Facebook is pushing their own tool, and their own libraries to go with it. Interoperability between Reason, Bucklescript, Ocaml native, OPAM libs, and the various build tools in between is confusing and ill-defined. The path of least resistance just seems to be "stay in our garden... there's no walls technically, but good luck hopping back and forth".

And all because some people are allegedly pathologically incapable of understanding a language without bolting curly braces on it.

It's the most absurd overcorrection for a pedantic complaint I've ever seen in tech.