I think the author has it right, Swift makes things easy, Rust is more challenging but better for high efficiency, embedded, etc.

I spent many evenings playing with Rust early last year, and more or less liked it, but I didn’t have a use case for really getting into it.

I have been switching prototyping between Swift and Common Lisp for a product idea I am exploring. I am used to effortless development with Lisp languages, and once I started hacking around with Swift, I found that it has few pain points and is generally a nice language. Two big advantages of Swift are the free Apple dev tools and TensorFlow for Swift keeps getting better. Additionally, Apples newest CoreML is really good.