LUKS is okay in compariton to GELI. btrfs doesn't have RAID10. btrfs RAID10 is actually RAID1 with some performance optimizations. zfs makes lvm obsolete. mdrai

LUKS is okay in compariton to GELI. btrfs doesn't have RAID10. btrfs RAID10 is actually RAID1 with some performance optimizations. zfs makes lvm obsolete. mdraid is inferior to zfs. I wouldn't say they are monsters. But, they are just not good enough. Because zfs native encryption is still immature for send/receive, there's still some value in LUKS, and zfs native encryption doesn't yet support multiple key slots because it is essentially unmaintained.