A new OS every year is just ridiculous. Pure ploy to get people to buy new hardware.
+1 to you being insane -- nobody expects you to buy new hardware every OS release. one of the valuable things about Macs is how many years of service they get...my 2006 imac is still in use, running ML.
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If you design operating system features that require newer and newer hardware for seemingly no reason (power nap, anyone?) then you must be insane
unless youre an electrical engineer on the apple hardware team, i doubt youre qualified to say why or why not hardware-related features like powernap should function on given hardware.