…their very welcome recent scoop that Apple has enabled read/write access in dev builds of its ZFS implementation.

If I remember correctly it’s neither a “scoop” nor “recent”. The recent reports are of a second seed; some months ago there were reports of the first seed, and those reports also mentioned that this was a read/write preview.

I haven’t read the article you linked to, and there are enough factual errors and provably incorrect claims in the quoted bits that I can already tell that there’s no point in doing so. Whoever wrote it needs to forget about Sun’s “marketing” engine and instead study the ample technical documentation about ZFS written by and for developers. If the author has even a modicum of intelligence then performing this research should quickly eliminate his mistaken beliefs about RAID, performance profiles, suitability for the desktop and such.

I personally can’t wait for the day that Apple ships a version of Mac OS X that you can boot from ZFS.