story
Let's not dismiss that their solution to remove the global lock has been both simpler than Python's (better funded?) ongoing work and backwards compatible; and the multicore support came with both a memory model with strong guarantees around data races, and effect handlers which generalize lightweight threads.
I agree that lack of unboxed types is a fatal flaw for several domains (Worse, domains I care about! I usually consider Rust/Go/.NET for those.) But when the comparison with OCaml is favourable to F#, the gap isn't much wider than just unboxed types. F# has an identity crisis between the ML parts and the CLR parts, its C# interop is decaying as the ecosystem evolves, and newer .NET APIs aren't even compatible with F# idioms (here's a .NET 6+ example [1]).
[1]: https://sharplab.io/#v2:DYLgZgzgNAJiDUAfA9gBwKYDsAEBlAnhAC7o...