And I had Linux running on PPC before Apple even bought NeXT (or rather the other way around, in terms of intelect), before Rhapsody, and before all those funny names that ended up being MacOS 8...
Fact is that Debian has had a much longer time to mature than OSX - I did not say that it actually is more mature, but it certainly had the time.
Also, dont forget that OSX derives from NeXTStep, which at the time was originally running on m68k, and then ported to other architectures, mainly iX86. The underlying system, Darwin, is very much a close relative to FreeBSD - at the time a X86 story, so OSX certainly has its "alian" legacy too.
Oh, and last time I checked, the man pages that comes with OSX are most useless as they dont cover OSX, but are merely general BSD4.4 manuals - has this changed yet?