I suppose I envisioned the app as something that simply slotted on top of the native system behavior and wouldn't break anything when closed. Less hassles, less

I suppose I envisioned the app as something that simply slotted on top of the native system behavior and wouldn't break anything when closed. Less hassles, less maintenance, and the user doesn't have to worry about automatic processes changing their system settings. As a consequence, you can set the wallpaper for each Space to a different image or directory in System Preferences, and the app will only expose its "gallery management" features when it can match the current wallpaper with an image in its assigned Source directory.