I think the most useful feature of modern filesystems (e.g. ZFS & Btrfs) relevant to desktop usage is the ability to create snapshot. Software store can automatically take a snapshot before add/remove/upgrade apps; if an upgrade causes issue (e.g. blank screen so there is no way to downgrade), just reboot and choose previous snapshot from boot entry.

https://arstechnica.com/gadgets/2020/03/ubuntu-20-04s-zsys-a...