Not ever having to deal with partitions and instead using data sets each of which can have their own properties such as compression, size quota, encryption etc

Not ever having to deal with partitions and instead using data sets each of which can have their own properties such as compression, size quota, encryption etc is another benefit. Also using zfsbootmenu instead of grub enables booting from different datasets or snapshots as well as mounting and fixing data sets all from the bootloader!