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The reason they cut off older macs was due to them not having AES accel in the CPU, so there was a small reason for it.

From the ARS review: "It’s not related to AES encryption acceleration, since there are Core 2 Duo and Core i3 CPUs in supported Macs that don’t support Intel’s AES-NI acceleration."

http://arstechnica.com/apple/2016/09/macos-10-12-sierra-the-...

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