Every daily log is the same as the dirt notebook. It reduces friction when going to create a note because you don't have to think about where to file the note _before_ it's even written. I tag things and can sort them later, if I want, or not. Or can schedule things to loop back into my life (move to the current daily) if I choose. It's the exact same concept as their dirt notebook.
It's not a new concept. Bullet journal, logseq, zettelkasten, org-mode, etc are all inspiration