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.
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