It doesn't sound like the guys understand how ZFS CoW works? So let's say the machine crashed after InnoDB had written 4KB out of a 16KB data file page to the filesystem. Due to CoW, the old data file page would still be there, unmodified. In contrast, on XFS or EXT4, without the doublewrite buffer, the data file page would be corrupted.

I have a lot of respect for Marko Mäkelä, as he seems like the only one who tries to steer InnoDB away from an evolution dead end. For example, in https://jira.mariadb.org/browse/MDEV-24449, he fixed a corruption bug that had existed since the very first InnoDB commit. At the same time, he also tries to simplify the internals, unlike Oracle who just churns out features along with regressions.

But there are always more corruption bugs within InnoDB. I am not even sure the log checkpoint mechanism is sound, where it does a fsync of the data files first, before getting the checkpoint position from memory, which may have moved forward after the fsync. This behavior also exists since the very first InnoDB commit.