How is it a problem from the user's point of view? If you're on Ubuntu, even if you have ext4 on root, all you do is install a single package and allocate an e

How is it a problem from the user's point of view? If you're on Ubuntu, even if you have ext4 on root, all you do is install a single package and allocate an empty partition for zfs and you're good to go and it's stupid to miss out on what zfs offers by sticking to ext4 forever. Flexible space allocation between volumes, instant snapshotting, transparent compression and backing up the entire filesystem to a remote server is already available if you choose to use zfs. Far better than using btrfs with endless report of corruption.