Some of this may be true, though I have some disagreements about the accuracy of some (and also the issue that "Linux" is a broad target and some of these apply more or less to different distributions or os'), but freebsd definitely had its share if chaos in its history. The fbsd4-6 era was a difficult one to navigate and it's basically where I feel off the freebsd bandwagon.
ZFS wasn’t just new when FreeBSD 6 was released, ZFS wasn’t even released itself. :P
FreeBSD 7 was the first release to support ZFS and even in that it was marked as experimental support.
So if you were using ZFS before FreeBSD 8, and especially somehow on 6 and below, then you’re very much using ZFS at your own risk and can’t really complain if things go sideways.
