Ah F#, my greatest love. How I wish the C# guys and girls would see this instead of further bastardizing (don't hate me) C# into being everything but poorly.
Don't you see that if you would use F# instead, creating projects with C# and F#, that you would get what is being added to C# but actually working and ergonomically? Interop is great!
It's a shame though that if you come from the world of OCaml, F# feels like its stuck in C#'s shadow a bit. You can get pretty far with F# by using it as a functional language, but eventually you'll want to interop with the rest of the .NET ecosystem and suddenly you're writing in a weird OOP/Functional hybrid style.
OCaml is wonderful too but having written F# for different companies for years, my code is pretty much never that hybrid stuff. Sure, .NET:s weird asynch apis, sometimes the code comes out a little bit weird but that is the exception to the rule imho.