Just another thought off the back of this, would it be possible to modify zpool 
status to also:

- Generate a warning if a pool has not been exported cleanly.  State that 
there's possible data loss.
- Check /var/adm/messages, or fma, and warn if there have been any messages 
related to drives attached to that pool.

That would go a long way to mitigating the 'silent' part of the data loss 
issue, although I'd also be tempted to have ZFS not automatically import pools 
that were not exported cleanly, forcing explicit action by the administrator.

You could then have the above warning messages displayed by zpool import, 
making it absolutely clear what has happened.
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