Agreed that the page is incomprehensible unless you already know what OSTree is. You could see as Git for operating system binaries. You can pull new versions

Agreed that the page is incomprehensible unless you already know what OSTree is. You could see as Git for operating system binaries. You can pull new versions and the currently booted system is a checkout. It provides many benefits, like atomic updates/rollbacks, integrity checking, signed commits, etc. Some distributions use OSTree, like Fedora Silverblue and CoreOS. Flatpak also uses OSTree as its store.