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#1
I think it just does it but never tells you. As I understand it, it does not defrag in the classic sense of moving data around, but cleans up the NTFS file system that gets fragmented over time.
There is the legendary Hanselman post that way overhyped this, and reality is mere mortals probably never get anywhere near the limit of NTFS file fragmentation to require NTFS defragmentation, but it seems Windows does it anyway. I am guessing MS do this to ensure a problem never arises (and to avoid any criticism?).
The point is that it does an ssd ntfs file system defrag frequently enough that you can never detect it ever being done.
The real and complete story - Does Windows defragment your SSD? - Scott Hanselman