I think "getting OCaml features at a slower rate than OCaml itself does" counts as "falling behind", yes.
2015 OCaml was an excellent language. 2020 OCaml is exquisite.
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What feature of 2020 OCaml do you think would convince JS developers to use Reason?
Monadic let syntax would be a big win (allows for async/await-like constructs) in Bucklescript, and inline variant records have been nice once or twice (I see reason newcomers at dojos do this naturally almost every time shortly after introducing variants).