I've not been seeing any of this much vaunted reliability. 3 out of 3 of the last drives I lost data on were ZFS. Meanwhile NTFS and EXT4 has been fairly trouble free.
Though to be fair hard to tell how much of that is TrueNAS vs ZFS.
That's what I thought given that it does have a good rep.
Haven't given up on it yet, but definitely less trusting - 3 different drives in 3 different ways wasn't expected.
That said - all consumer class gear in janky environments so there may very well be other factors lurking.
I'm using a Supermicro board, with ECC RAM, but anywhere from 4 to 6 drives in the pool (upgraded over 6 or 7 years now).
Perhaps ubuntu was the culprit, not ZFS?