Because.
90+% of the normal desktop users will run a non-redundant pool, and
expect their filesystems to not add operational failures, but come
back after a yanked power cord without fail.
OpenSolaris desktop users are surely less than 0.5% of the desktop
population. Are the 90+% of the normal desktop users you are talking
about the Microsoft Windows users, which is indeed something like 90%?
If you really want to be part of the majority, perhaps you installed the
wrong operating system. If you want to be included in the 0.5% of the
desktop population who are smart enough to run OpenSolaris, maybe you
should add a mirror drive.
Not to be a party pooper, but once the Apple brigade gets their filthy
hands on ZFS (post-Snow Leopard?), it will be an issue.
Personally, I run a mirror.
-mg
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