I wonder why they went this route.
Most apple volumes are already logical volumes (check diskutil list).
FileVault itself is, right now, implemented as part of corestorage (see diskutil cs for the encryption/decryption commands).
I assume they decided they just wanted to go the entire ZFS route and get rid of core storage in favor of a pool model, but still ...
> APFS supports encryption natively. You can choose one of the following encryption models for each volume in a container: no encryption, single-key encryption, or multi-key encryption with per-file keys for file data and a separate key for sensitive metadata. APFS encryption uses AES-XTS or AES-CBC, depending on hardware. Multi-key encryption ensures the integrity of user data even when its physical security is compromised.
[1] https://developer.apple.com/library/prerelease/content/docum...