> You can do that with ZFS today.

I appreciate what you are saying, but we are talking about different things.  

RAIDz does not let you do this:  Start from one disk, add another disk to 
mirror the data, add another disk to make it a RAIDz array, and add another 
disk to increase the size of the RAIDz array.  

Solaris software RAID5, Linux software RAID5, and many hardware systems with 
RAID5-like functionality, all support adding a disk to a RAID5 array.  So it 
makes sense that people expect the same feature from RAIDz, a system that 
appears very similar to RAID5.  As of now, RAIDz is missing this check mark.  
Personally I don't use RAIDz for this reason.
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