I've always championed writing as a way to get your thoughts external to you. It leads you into more objective territory, where you can reflect and assess more effectively.
The Second Brain is more than that - it's dumping all your notes into a tool like Roam that provides features for connecting them together.
Methods like Zettelkasten provide formalism to it, but at it's base, all you need to do are write your notes and somehow indicate that some of them are connected.
The idea is that you will discover connections between them that you otherwise might not have realized.
Some reading:
I'm starting to find more and more tools fitting the second brain/note management concept, which pulls them into the same ballpark as Yodo, hence my interest.
Second Brain/Wiki/Note Management:
Productivity, auto-time tracking:
Related reading: