Apple lost intuitive when it went to OSX. Things were just there, and worked, menus had understandable names dialogs were terse and to the point. Sometimes it was messy but you never felt lost.
Just to be clear: you are seriously suggesting the intuitive usability of went down in OS X? As opposed to the label-less icon buttons in the control strip that you had to click/drag to get it to show and hide?
The release of OS X, and the subsequent program rewrites to support it, put apple back on the tech map. I find it hard to believe this doubled as their usability death sentence.
Im not saying it was less "Usable" using BSD saved them from years of pain transitioning from MacOS to something that was more network/internet savvy.
But there was a price was a hit to the UX and UI. which were actually pretty sensible. All the fancy graphics and lack of helpful text labels and assistance has become more a pain for new users.
