This is very interesting and something I've been playing around with in my head. I keep "chasing the dragon" when it comes to note taking apps/approaches. I've played with everything from NvAlt+SimpleNote (for iOS), Evernote, Notion, Drafts, Editorial, Obsidian, and more. Most recently when I was experimenting with the Zettelkasten notes system (in Obsidian) I got the idea that I would want to do exactly what you talk about and have a "note" per person where I could store trivia, gift ideas, birthdates, etc.
Unfortunately I either don't fully understand Zettelkasten or I am paralyzed by indecision on where I split my notes and how I organize them. I guess I'll just continue using Drafts as my "brain dump"/"all text starts here" until I can find something better that is lightweight and works across iOS/macOS.
I have the same issue with organizing my notes. On the mac, I have recently started using agenda (https://www.agenda.com/) and am really liking it. You can easily link notes to dates, events, and other notes. You can export notes and sync through iCloud or Dropbox.
The free version already gives a lot of useful functionality and they have an interesting payment model in which you unlock all current features (and updates over the next year) with a single payment. Hence you could use it as a subscription or simply pay once if the new features are not yet worth it to you.
Have you found any note taking mobile apps that can also sync with Dropbox to be edited as plain text files? I do most of my note taking in vim on my laptop, but when I only have my phone I'm reduced to use simplenote and Google Keep and can't easily access my normal notes.
After 15 years of searching I haven't found that seemingly simple combination of features.
I was playing the note chasing app game, too. I eventually settled on the native iOS/macOS notes. I like it because I don't get paralyzed by trying to perfect the organization of my notes, and it syncs across my devices as expected.
Unfortunately I either don't fully understand Zettelkasten or I am paralyzed by indecision on where I split my notes and how I organize them. I guess I'll just continue using Drafts as my "brain dump"/"all text starts here" until I can find something better that is lightweight and works across iOS/macOS.