This is not a useful distinction because it'd be the same UI. If you grant an app a more specific capability, that just means a more specific permissions dialog

This is not a useful distinction because it'd be the same UI. If you grant an app a more specific capability, that just means a more specific permissions dialog. If you don't change the dialogs, the capabilities are going to be the same access it is now. I don't think users want to deal with much more fine grained dialogs. And it does have more specific capabilities called "security-scoped bookmarks".