I take a ton of notes in Notes.app (and previously Simplenote). My preferred workflow is to keep a note in Notes.app until I’m “done” with it. At the point of done, I save the note as PDF to a local folder.
This distinction between active notes and completed notes is key for how my mind works. Something about reducing mental clutter, or insert your diagnosis here. I want to keep the notes around for future reference but I want them stored on my shelf.
I’d love to instead have a dedicated app serve as my note archive. It could be web or cross-platform as long as it kept privacy at the forefront. Importantly, it would be read-only; it wouldn’t take on the concern of also providing an editing interface.