To clarify some confusion about QuickStart apps, they are really just a short-cut to help new app creators rapidly build apps. Instead of having to say “New App”, open the dialog, choose a sheet, etc, this takes the most recent updated sheets, checks if an app already exists on it, and if not, shows a “fake” quickstart app. This is not created until the app creator actually clicks to open it. For a brand new app creator who signs in on the website and doesn’t know what to do next, this is helpful.
However, it becomes less useful for more experienced app creators, which is why we turn this off after a few days.