Can you explain why you feel that way? ZFS has intelligently managed RAID that keeps the performance penalty minimal. I'd rather have multiple-redundancy parity than 2x mirroring, and it takes less space.
There is RAID-Z2 which allows for 2 discs to fail and RAID-Z3 which allows for 3. Problem is rebuild time is still slow. I wouldn't recommend to use RAID-Z1.
