Really? Are we still talking about how OS X doesn't give you "full control over the system?" Given the popularity of Macs in the developer community, it's pretty clear that you have as much control as you desire—Unix has incredible power. And if you still somehow feel that OS X is actually constricting you (rather than just hiding advanced settings in the command line), you'd never be able to run Linux on a Mac. No,…
Didn't OS X users just get the ability to resize windows by any edge or corner? They only had to wait 10 years for that wonderful feature.
How about being able to properly replace the Dock? You can't, because Apple does not allow non-Apple programs to affect NSScreen visibleFrame.
Maybe you can tell us how much Finder can be controlled versus the file browsers in Windows or say Gnome/KDE? Wait, nope - turns out it's sorely lacking in extendability hooks.
Furthermore - OS X has shitty package management and limits what you can do with your terminal as well because you cannot replace certain packages without breaking your entire system - http://cloudhead.io/2011/04/18/why-osx-doesnt-cut-it/
So, no...OS X is not as maleable as other operating systems.