From the Blog post:

> We looked at this issue earlier. Fundamentally the tension here is that copy-on-write semantics don’t fit with the emerging zone interface semantics.

While the paper writes:

> It is not surprising that attempts to modify production file systems, such as XFS and ext4, to work with the zone interface have so far been unsuccessful [19, 68], primarily because these are overwrite file systems, whereas the zone interface requires a copy-on-write approach to data management

This seems to be a contradiction, and I'd side with the original paper.