In fact, Apple is doing more and more to isolate users who like to tinker under the hood!
My version of that statement would be...
Apple is continually making it easier for the non-technical user to make full use of their computers and keep them up to date and at the same time providing unprecedented access to the internals of the system for technically inclined "power" users.
In support of that last statement I submit for your consideration Developer Connection, Apple Script, Automator, Developer Tools, Console, Terminal, MAN,
etc. Short of being a member of Apple's development team you can't get any closer to the system internals than that. Of course, all of these demand more knowledge and skill than is possessed by probably somewhere between 80 to 93% of the user base. Based on those users I support, 100% are perfectly content not knowing anything about the internals of OS X, all they care about is "it simply works".