

A dual disk setup for ZFS (or any other kind of RAID) is super wasteful.
Based on what? I’ve been running ZFS since it was Solaris-only and raidz1/raidz2 are OK, but they come with complexity and performance penalties, and they’re somewhat less portable than a mirror. There are many advantages to simple mirrors: first-response reads, block correction, scrubs, etc.
Hard disagree, and it is one of the best things about ZFS. You can plunk a ZFS pool on another system and be almost certain it will import. Systems die. Having been through several data-loss incidents, I find it is much preferable to be able to pull 1 disk than have to drag out 2 or three to transplant a ZFS pool.
Regarding the scrubs, I was trying to indicate that ZFS is more than just a raid manager, there are advantages to ZFS on even a single disk.
If that were entirely true, striping would be the most popular ZFS pool arrangement, since you get performance and max storage.
Edit: this was not to say “you’re wrong”, just different approaches to storage.