This isn't what I expected from the headline (i.e. notetaking software), and it's not something I could ever see myself using, but I really do like the design (

This isn't what I expected from the headline (i.e. notetaking software), and it's not something I could ever see myself using, but I really do like the design (and your answers here). The human-readable (Markdown) database format is clever. The friend identification algorithm is simple and elegant and sounds pretty effective. And the natural language input format. Every one of these decisions is "bad" in the sense that they aren't perfect or could cause problems down the line, but it seems like they all work just fine for the intended purpose. So let me suggest that more designers and developers consider the scope/scale of their problems and try to choose simpler options (even "hacks") when they make sense.