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using it on my notebook with native encryption and I'm quite happy - there are some things missing / work in progress for quite a while - unfortunately it looks like it's not a priority at the moment for the current sponsors or there is a lack of time - not a criticism of zfs but I'd love to see these features merged sometimes in the future:
- no overlayfs yet (https://github.com/openzfs/zfs/pull/9414) - the docker zfs driver is very slow and buggy - best to create a sparse zvol with ext4/zfs/btrfs and use this for /var/lib/docker
- no directio yet (https://github.com/openzfs/zfs/pull/10018) - not sure if this is so useful beyond specialized databases that utilize that.
- no idmapped mounts yet (https://github.com/openzfs/zfs/pull/13671) - this would be useful for lxc/lxd
- async dmu (https://github.com/openzfs/zfs/pull/12166) - complicated patchset would transform a lot of operations into callbacks and probably increase performance for a lot of workloads.
- namespace delegation was recently merged: https://github.com/openzfs/zfs/commit/4ed5e25074ffec266df385... with overlayfs / idmapped mounts it should be possible to have zfs datasets / snapshots inside a lxc-container which could be super cool for lightweight container things.
- no swap on zvol at the moment (https://github.com/openzfs/zfs/issues/7734) - this is some hairy memory allocation problem beneath it and I don't really use swap - just something to be aware off.
- arc vs. pagecache / performance (https://github.com/openzfs/zfs/issues/13736) - zfs is usally very fast but there are some edge-cases where it's not at the moment.