Shipped, thanks to you: the copy-on-write room now opens its sources in a side panel. Your comment went from here to production in about four hours. Others rooms to come. The rendering is far better!
I would say (in no particular order) that the CDDL license is not innocent, ext4 is good enough for many usages, cost ? ZFS is RAM hungry ...
but ZFS is well present where it means most (NASes , Proxmox , backups to tell some)
Thanks, that's exactly the reader I'd like to reach, and you're not the first to say it goes over your head. Honestly, I'm still trying to figure out who it doesn't go over the head of. Matt Ahrens, maybe? ^^ Next is a "start here" route: one plain question per room, answered before any code. Copy-on-write and snapshots are probably the best rooms to start with today.