I’m not familiar with what Suse is doing, but that doc seems to imply that there is a fundamental difference in the configuration between Gentoo and Suse.

I wonder if there is something in the Suse docs that describes how they get a rollback option into the grub menu.

I agree that the Gentoo wiki pages around btrfs and snapper seem a bit lacking.

Got too big and went from showing the process of building interesting things to showing off things other people built.