Why does it seem like I'm hearing about OCaml all the time now? It could just be frequency bias but it wasn't that long ago that I'd never heard of it and now it seems to be getting a lot of attention online.
In my opinion, OCaml would see even more widespread use if the documentation were improved. I find it a chore to figure out how to use OCaml well. I also would like to use third-party libraries like Jane Street's Base because they've put a lot of work into providing even more functionality in their standard library, but their documentation is absolutely atrocious (where it exists at all).
OCaml is a mature language but does not have a very supportive ecosystem. I'm hoping the renewed interest will prompt changes there.
I felt that way about a dozen years ago. These things have cycles, apparently. But they also recently released multi-core OCaml in OCaml 5 which opens some doors for OCaml that were previously not open.
Edit:
I have used OCaml in production and currently I don't see a point to doing it again for the vast majority of problems. From a holistic language + runtime point of view OCaml occupies a space where it's not useful enough from a runtime perspective to replace any of the more convenient languages that exist and not low-level enough to fill the spot of any of the good alternatives in that space. Modularity-wise functors are nice but ultimately plenty of alternatives exist even it the lower-level languages.
With all that said, people should probably use the hell out of it if they're excited. It's a bit tiring seeing the constant stream of misinformation regarding alternatives to OCaml, though. There are good reasons it's losing out in industrial use to even languages like Haskell.