Bingo. I'm tired of people claiming that macOS (XNU more specifically) is just BSD under the hood. It's called X is not Unix for a reason!

I feel like so much awesome engineering in XNU around security and portability, as well as innovations like IOKit are swept under the rug because "it's just FreeBSD."

I still think it's a shame that more people don't take advantage of the Mach side of XNU more. Launchd and Mach ports are a powerful combination IMO.