I feel like writing a specific app is not only more effort on your part but easier to ignore on mine (and more friction, a lot of people are hesitant to install new apps).

Personally I'm a big iMessage/Telegram user and as such unlikely to leave things unread on those mediums (they're one of the few apps that I allow to push notifications and display an "unread" badge); my reading of your post was that a selling point of GinkgoNotes is that it appears in already established workflows.