Apple hasn't done any work that would be useful.

Any is a bit too strong. Apple has does (and still does) some useful work with clang/llvm, and a few other tools that BSDs use. However this is indirect at best.

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Lammy 3 days ago | parent | prev [-]

Weird to see this downvoted, because it's totally true. Apple imports FreeBSD's userland periodically but not its kernel/drivers, and thus has nothing to do with how well FreeBSD works on PC hardware: https://wiki.freebsd.org/Myths#FreeBSD_is_Just_macOS_Without...

	▲	AdieuToLogic 2 days ago \| parent [-]
		> Apple imports FreeBSD's userland periodically but not its kernel/drivers ... OS-X/macOS runs an entirely different kernel called XNU[0][1], which is why userland tools can be imported whereas FreeBSD kernel and device driver code cannot. 0 - https://en.wikipedia.org/wiki/XNU 1 - https://github.com/apple-oss-distributions/xnu