A solid article, but missing discussion of XFS and Btrfs. I would have enjoyed the author’s analysis of the former in particular, especially as compared to ext4.
Yeah...he even alludes to it in his APFS section: "hey I talked about all those other filesystems so I can talk about what I really want to talk about...how awesome I think APFS is".
I wouldn't mind seeing BcacheFS compared too, despite the current falling out between the main dev and Linus and its exclusion from the kernel (which will hopefully be a momentary thing).