Having experienced all of these methods. I've found myself regularly searching through my vault and referencing older material. While the notes hand-written on a tablet, made it much easier to sift through vast amounts of material I was ingesting at the time. I find myself unable to re-use these notes in any meaningful way. They still exist, I can access them, but I don't find myself going back to them. Old paper notebooks? Most of them are destroyed, lost, forgotten to time.
The knowledge management, with easily indexable and searchable contents, has this invaluable perk of being accessible at a moments notice. Keeping potential of being relevant.
I read a post recently about using a local LLM to OCR handwritten notes that I intend to trial soon:
https://andrewdoering.org/blog/2026/remarkable-local-handwri...
Any thing else goes to the PKM in a structured and often actionable way. It is my notebook, my business development system, my todo list, my brain dump, my list of contacts, etc. What I particularly value is the easy ability to enrich a document with cross-links. This is for me the strongest point of PKM as the one I have in Obsidian.
Some people then add layers of fetishizing to that, because humans gonna human, but the actual idea itself doesn’t deserve to be tarred with the same brush.