On: I nearly lost the Lightroom catalog with of all my...

[sieve]

> not admin my ZFS system.

Ubuntu/Manjaro comes with default ZFS support. There is no administration involved beyond the initial setup.

[bluGill → sieve]

There is still administration required. Sure ZFS itself is easy, but the rest of the ecosystem on top of that is hard. You need a lot more software than zfs to make something useful.