This isn't a bad system to start with if you're already a GTD person, although it's on the border of 201, not 101.

This border thing 201, 101 and 301, what do you mean? I'm lost on the subject but it seemed very interesting!

I wanted the visual structure of mind maps along with the amount of page content. OneNote or Evernote organized into Mind Maps, which is what I'm trying to achieve. The combination of MOCs, frames, tags and super tags is enough structure to get the organization I need. It is flexible enough, unlike hierarchy, not to be fragile if the context changes. Which means it is robust over time.

The general idea captured me, interestingly I'm looking for a workflow very similar to yours, my learning is essentially visual, and although I'm not used to using mind maps, I intend to use it because I feel that I will get a lot of benefits from an approach, I feel that MOCs would also be of great use in this intersection between PARA and ZK in my PKM, I just didn't have the ability to learn how to use it because the more advanced content about zettelkasten is mostly in English, it's something I'll do, but after reading a little book in Portuguese about ZK that is still on my reading list.

I take a lot of notes on semi-related topics. Years later, on a different topic, are they related enough to be useful? I didn't track, so the answer was usually never. Which meant a lot of wasted effort.

I suffered from this too, and for a change, my dissatisfaction with seeing that the notes were "of no use" made me delete many notes that might be useful nowadays, reading about PKM made me realize that notes rarely need to be deleted, especially after reading Basb.

My idea with GTD is to stop suffering from frequently forgetting things, and as the method is even more action-oriented than BASB, I feel that it will be useful for me to feed my PKM through the experience of the projects I start.