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MacOS does what the user wants,
The ONLY OS that ever did this was AmigaOS. Apple has always insisted you work its way, it has always closed off its OS to the user,it never allowed significant user-customization of the OS. Yeah its UNIX underneath, now, so it mutitasks and yeah its more secure than Windows but with Apples resources and 10 years available to it the Amiga could have been at the same place as OS X, 9 years ago.