I wondered if suggestions 2 and 3 were also marked private preventing anyone besides me from seeing / voting on them also. Why yes, they are. No wonder they’ve been unpopular suggestions. 
Look for the little Red Lock, and here is what it means:
Naturally, I cannot change it. 
So I get it, sVDEV is likely considered a less popular option to work on than a graphic showing off which drive in a hot-swap array has gone bad. But I’d really like to see iXsystems invest a bit more in the documentation and implementation of sVDEVs also.