ZFS on Linux has been around for 3 years now and is integrated in Ubuntu 16.04 - I'd argue that by now it has received more usage than the BSD version.
You can argue that the earth is shaped like a torus. I can argue that the moon is violet. That is not the point, and has nothing to do with the merit of the argument.
Setting this aside, all usage hours are not equal. How do you compare an hour of enduser desktop usage on Ubuntu 23.57.something to a usage hour of a commercial NAS storage solution internally based on FreeBSD and ZFS?
Do you think the enduser performed comparable product testing cycles?
I've seen ZOL systems where the zpool claimed it was online, but contained no vdevs. `zfs list` had no datasets, but datasets where mounted and trying to read from them got your process stuck in-kernel.
It just lost/forgot its devices.
Up until one of the latest releases on every boot you could roll the dice by which name your pool would import the devices. Behaving differently on identical machines and setups. Personally, I am still not trusting that problem to not reappear again.
ZOL is bolted on. With a large nailgun. Simple as that. At times, it feels about as integrated as pjd's original patches distributed on the FreeBSD mailinglists.
And since this division is not technical, but legal, based on the license choice made 30 something years ago for Linux with regards to where the code could be exported to and what could be imported into, this situation will not resolve itself.
