Not to demotivate anyone / anything, but this sounds like the least useful parts of both worlds; programming JS (and having to deal with typing and correctness with other tools) to run on the OCaml runtime (which as noted, is really only better on a small subset of devices).

On the other hand, cool to see the investment in OCaml, and such a popular language able to run on its runtime! I hope that with all this newfound interest from the industry and the community more OCaml resources and more development in the compiler start to happen!