Can’t seem to find any discussion of this topic, so I thought to post it here. When 10.13 High Siera was released, there was a written kind of promise that APFS did work with RAID arrays. Now I realize I have a double whammy, my boot volume is a RAID 0 array of SSD drives. We KNOW that APFS can NOT be done on arrays. I have heard horror stories about some trying to update from Sierra on arrays to the point where I have NOT gone to High Sierra.
BUT this whole issue seems to have totally slipped under the rug, nobody, but nobody ever seems to want to talk about it, much less get some actual direction from Cupertino.