Again as a frequent FreeBSD user, "FreeBSD/macOS" is not really a thing. There is historical shared code but they are different beasts. Sometimes there is subst

Again as a frequent FreeBSD user, "FreeBSD/macOS" is not really a thing. There is historical shared code but they are different beasts. Sometimes there is substantial porting involved to get things from one to the other and they are not really the same entity. Additionally, the BSD pieces of macOS are frequently out of date and a hodgepodge of components. Personally, I have very frequently had the experience that Unixy stuff that "just works" on *BSD or Linux does not work on Mac straight away, or breaks with a new OS release, etc. It takes effort for the homebrew folks or the macports folks or whatever to keep stuff working.