I don't think Swift really competes with Rust or Go at all.
- Go aims to be simple enough for many engineers to be productive with little investment.
- Rust aims to be extremely reliable and efficient.
Swift is very complex, and makes many compromises away from reliability or efficiency in favor of application use cases.
Swift may fill an interesting role for a "native C#" that is mostly reliable, mostly efficient, and somewhat productive, but on the other hand, C#, OCaml, Java, Kotlin, and so on already have various answers to that, and they're only becoming better at it.
The only real advantage it has (as far as I can tell) is iOS (and TensorFlow almost as a knock-on of being the only serious language for iOS).
- Go aims to be simple enough for many engineers to be productive with little investment.
- Rust aims to be extremely reliable and efficient.
Swift is very complex, and makes many compromises away from reliability or efficiency in favor of application use cases.
Swift may fill an interesting role for a "native C#" that is mostly reliable, mostly efficient, and somewhat productive, but on the other hand, C#, OCaml, Java, Kotlin, and so on already have various answers to that, and they're only becoming better at it.
The only real advantage it has (as far as I can tell) is iOS (and TensorFlow almost as a knock-on of being the only serious language for iOS).