I think GP's comment is fair. The portability of Rust is of a completely different order of magnitude than Swift. I mean, people have actually gotten it running

I think GP's comment is fair. The portability of Rust is of a completely different order of magnitude than Swift. I mean, people have actually gotten it running on Windows 98 SE. And on Windows, Rust has access to a rich winapi surface, nice COM wrappers (including semi-official support through Microsoft's com-rs), a WinRT projection. Not to mention that crates basically just work. Maybe it isn't a first-class supported language for Windows just yet, but it's starting to feel pretty close.