An unforeseen benefit of assigning #JohnnyDecimal IDs to everything (and cleanly distinguishing between what I consider "public" and "private" stuff) is that I can refer to private stuff in public without actually mentioning it.

For example, I can complain about how complex [401.12] is and how hard it is to debug, and as long as I don't get into specifics, it's perfectly fine.

Small #JohnnyDecimal update: I feel like I'm using the folder structure in my Obsidian vault as my index. It's a nice foldable tree view, drag-and-drop capable, simple to add, remove and rename stuff...
Maybe I don't need an 00.00 index note / database / whatever...