This talk by Tim Standing (one of the developers behind SoftRAID) is an excellent analysis of APFS:
http://docs.macsysadmin.se/2017/video/Day3Session4.mp4
He has some very interesting points and conclusions – one of which is to never install APFS onto non-SSD (traditional spinning-platter) drives. The revelation that a major change was made to APFS very shortly before its release is also a little troubling, but at least that explains the current lack of documentation :-/
Thanks to Ronald Leroux for bringing this to my attention.
[…] of OWC gave a great presentation about APFS at the MacSysAdmin conference in Göteborg (via St. Clair Software). Topics include previous Apple file system efforts, the fragmentation caused by copy-on-write, […]