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This rings true to me as well. I'm not sure what I get out of F# that I can't get from Rust, unless you specifically want .NET, which I don't.

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You get speed of development, productivity, lots of libraries. You get something that is easy to learn and understand.

Lots of libraries if you want .NET, right? But if you don't, Rust has way more libraries

Speed of development is debatable. I think you can be pretty fast with both.

Easy to learn I concede but it gets easier with time, until it becomes very easy

Having written a moderately big project in OCaml which I tried porting to F# and later did port to Rust, to me Rust feels much faster to develop than either OCaml or F#, especially once you figure out the "core", adding more features is a breeze. Refactoring is also easier. Not to mention that reading Rust is much easier than reading OCaml and coming back to the project after a year feels very easy. I think that I have less bugs with Rust than with OCaml. And the end product's core ended up being ~3-4 times faster to execute in Rust.

Less arduous memory management.

I am not sure what you mean. My memory management for a recent 30k LOC app boils down to "thinking before cloning"

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