Earlier quoted context omitted.
Your typical Linux stack is far more configurable and customizable than the Mac stack. You typically have far more configuration levers, as well as deeper customization access. The stack is built entirely from open, accessible source, so you can ultimately customize every single part of it to your exact liking. For example, KDE has an order of magnitude more levers than the OS X DE.
You realize OSX is BSD, right? Just because they didn't build you a configuration button for everything doesn't mean it's not configurable.
Not only is most of OS X closed source, it's also not particularly configurable.