>>51088015NTFS hasn't seen a major update since XP, and the core structure is the same as it was for NT4. It's still fundamentally the same as it was almost 20 years ago. That's not necessarily a bad thing for compatibility reasons, but the portion of the driver that does block allocation is absolutely horrendous. That's the major reason why fragmentation is worse on NTFS than other similar filesystem like ext3/4 - because it's not as smart. You could argue that fragmentation is no longer an issue thanks to SSDs or online automatic defrags, but it should have never been an issue in the first place. Plus, it's really showing its age compared to the copy-on-write and snapshotting capabilities of ZFS/btrfs.
The compatibility issue also isn't nearly as much a problem as you'd like to make it, since there's no reason the driver would have to disappear in favor of a replacement. Microsoft introducing a more modern file system wouldn't suddenly break every NTFS volume on the planet.
