Just to name a basic use case: you share sth from one app and save as note to SideNotes. You would expect it is visible on your other devices since iCloud sync is enabled. But no, you need to physically run the app every time you save sth so it syncs. First time I see such drawback in any of the apps I own. Further, on iPad the screen is empty, you need to press the button at the top left to see your notes. App in such state should not be published.