Why is x86_64-apple-darwin (Mac on Intel) a tier 1 target but aarch64-apple-darwin (Apple Silicon) is tier 2?

https://doc.rust-lang.org/nightly/rustc/platform-support.html

I find it odd that the previous architecture for Mac has more support than the current one.

One of the things that's needed for Tier 1 is hardware in GitHub actions for CI.

As far as I know, Apple hasn't put a bunch of its silicon there for open source projects to use, and thus it can't be Tier 1.

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