To me, the most implausible thing about ZFS-without-ECC doomsaying is the presumption that the failure mode of RAM is a persistently stuck bit. That's way less

To me, the most implausible thing about ZFS-without-ECC doomsaying is the presumption that the failure mode of RAM is a persistently stuck bit. That's way less common than transient errors, and way more likely to be noticed, since it will destabilize any piece of software that uses that address range. And now that all modern high-density DRAM includes on-die ECC, transient data corruption on the link between DRAM and CPU seems overwhelmingly more likely than a stuck bit.