Swift is very weak outside Apple ecosystem, compared to Rust. Not sure nowadays, but Swift used to have breaking changes each major release, that's a non go for a big project.
Andreas Kling talked about it. It boils down to C++ interop sucks (no surprise for lang made by Apple), ecosystem is tiny, Rust works well enough with LLMs.
Swift is very weak outside Apple ecosystem, compared to Rust. Not sure nowadays, but Swift used to have breaking changes each major release, that's a non go for a big project.