I think it’s less notebooks or typed notes, and more the issue of cargo cults built around frameworks and systems. Bullet journals are a handwritten PKM, aren’t they? And they were definitely a fad around the fetishized ideal of creating perfect notebooks.
Bullet journals are the opposite of a fad that fetishizes perfect notebooks. Proper bullet journals are very pragmatic.
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.
Okay, well I don't mean the sense of a perfect notebook that's pristine, so much one that is a panacea for one's knowledge-management needs. Like any productivity trend, it seemed like the bullet journal method inspired a cottage industry of influencers with their bespoke variants and people sharing their journals for the sake of it and heck I'd argue that if there are merchandise- pre-bulleted notebooks sold in stores- then your framework has become a more consumer-driven than pure productivity. But that's no better or worse than GTD, or Zettelkasten for that matter.
