13.0 to 13.0-p1 is a smaller lift than 11.x/12.x to 13.0, if you are doing ZFS on root, Boot Environments are the easy way to roll back. Just remember that ZFS is now OpenZFS so don't automatically do zpool upgrade. Wait until you are sure everything works in 13.0 and you don't need to roll back.
I've got 2 machines that went from 12.x-RELEASE to 13.0-RELEASE and so far not an issue; of course they aren't production servers or mission critical, just a couple of desktops.
Of course, just my opinion.