The odd thing is that SMR may actually improve performance for many mainstream workloads because it turns random access writes to sequential writes. Similar techniques are used in software for write-heavy workloads (e.g. cache helps with reads more than writes, only helps with writes if they are battery backed and it can help a lot of if writes are sequentialized)
This is why WD figured they could get away with it, but it's a shame what it does if you're rebuilding your ZFS array (if they'd actually talked to customers they might have find a lot of people who buy big drives are ZFS heads!)
Myself I had a security camera set up to monitor my "cat room" last summer when I was trying to gentle a feral cat, I am thinking of pointing it at the driveway and monitoring it with ZoneMinder. ZoneMinder wants its own volume to write to, I am thinking of putting in a spare Intel SSD (superior, though review sites never told you) for that purpose, it's not like I need to store terabytes worth of video from it.