You got me. It was super inaccurate to use "proprietary" here (though if i understand correctly, podman is another option that is FOSS).

License aside, though, I would still bet that relying on the Apple-specific version of something like this will cause headaches for teams unless you're operating in an environment that's all-in on Apple. Like, your CI tooling in the cloud runs on a Mac, that degree of vendor loyalty. I've never seen any shop like that.

Plus when this tooling does have interoperability bugs, I do not trust Apple to prioritize or even notice the needs of people like me, and they're the ones in charge of the releases.