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...and no access to multicore processing that's been ubiquitous for over a decade?

You can use multicores, just make processes.

I was quite amazed that this wasn't the case. OCaml clearly is working on it - http://ocamllabs.io/doc/multicore.html

Plus there are monadic ways of handling concurrency with lwt.

A question: can OCaml’s object system be used to implement a runtime similar to that of Objective-C (things like obj_msgsend)? Or does OCaml’s type system impose restrictions that prevent this level of dynamic operation?

Does anyone actually use the OO stuff? Last I checked, the consensus was that it was a failure and that it should be avoided in modern OCaml.