It's very amusing that this kind of legend has persisted! ZFS is notorious for *noticing* when bits flip, something APFS designers claimed was rare given the robustness of Apple hardware.[1][2] What would ZFS on iPhone have looked like? Hard to know, and that certainly wasn't the design center.

Neither here nor there, but DTrace was ported to iPhone--it was shown to me in hushed tones in the back of an auditorium once...

[1]: https://arstechnica.com/gadgets/2016/06/a-zfs-developers-ana...

[2]: https://ahl.dtrace.org/2016/06/19/apfs-part5/#checksums