As we all know, Apple RAID was absent in El Capitan. It has been reintroduced in macOS Sierra. However, because of a bug (in 10.12) in driving Dell external displays, I've not upgraded yet. 1 -- Does anyone know if it has been coded differently than the Apple RAID we last saw in Yosemite? For example, SoftRAID claims that their drivers will produce data transfer rates that are "86% faster than Apple RAID," so I'm wondering if that comparison is still valid. 2 -- Will a couple of RAID1 sets I created under Mavericks still retain functionality under macOS Sierra — i.e., if I lose a disk and need to rebuild the array will macOS Sierra be able to do it? 3 -- Are there any rumors about just why Apple removed Apple RAID from El Capitan only, strangely, to reintroduce it in macOS Sierra?