There were many assumptions about the demise of ZFS in Mac OS X. The only thing you can say is that (a) it is out of date, almost certainly forever, and (b) that no one knows the real reason why, or at least least does not say.
Update Jeff Bonwick, creator of ZFS, suggests there was a lack of (commercial) licensing agreement . It was a blocker.
Responses to litigation and litigation regarding excessive licensing fees and the impact of the Snoracle transaction were proposed; the other is system stability. However, for some reason it doesn’t matter, since the end result is the same - Apple no longer supports ZFS on Mac OS X.
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