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The optimizer just TRIMs the free space, something that the Windows 8 and 8.1 drive optimizer does anyway.
It may have had some sense in Windows 7, but is obsolete in 8/8.1. Not that this is really needed in the first place with working TRIM.
Windows 7 has trim support as well... So I guess that's why they don't have that specific feature since it would be redundant as I understand it.