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Nobody said it would be easy, but it is already happening.

https://medium.com/@tinocaer/how-microsoft-is-adopting-rust-...

https://preettheman.medium.com/this-is-what-apple-uses-rust-...

I don't think Apple is shipping anything customer facing that's built on Rust?

Not in rust, but they did:

- Add reference counting to ObjC to get rid of a lot of use after free bugs (still of course possible because it's just a language suggestion and not strictly enforced like Rust or Swift)

- push for adding ObjC notations to let the tooling help catch some set of bugs. Still not perfect by any means but helps a little.

- created an entirely new memory safe language as Swift.

Apple+ has some stuff in Rust, in my understanding.

Did you even read what you linked? I wouldn't say "already happening" more like first early steps. Operating systems have a massive attack surface, would take years to convert code from C\C++ to Rust and likely be more vulnerable initially(the old code base went through decades of scrutiny, hundreds of scanners\fuzzers etc)

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