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The Intel chipset documentation says: 5.18.1.3 Hot-Plug Operation
Dynamic Hot-Plug (for example, surprise removal) is not supported by the SATA host controller. However, using the PCS register configuration bits and power management flows, a device can be powered down by software, and the port can then be powered off, allowing removal and insertion of a new device.
Note: This Hot-Plug operation requires board hardware (implementation specific), BIOS, and operating system support.
And if I had to guess I'd say Apple probably didn't implement it.