Are written notes any use in martial arts?

While I'm stuck in lockdown and public classes are closed, I've been thinking about "codifying" my baguazhang knowledge (for want of a better word).

All those techniques, principles, drills and such are sometimes hard to call to mind and I wondered if writing a series of annotated lists would help me to organise my knowledge better?
All this knowledge in my head, would it be better recorded or more use carefully scribed into a nice little, thematically-appropriate notebook?
Would having those lists to refer to actually improve my practice to any meaningful degree?

Would they make me a better and/or more knowledgeable martial artist? More so than a reading a book written by someone else?

Well, looks like this weekend (i.e. the next opportunity for free time) we may find out!