I don't think human vs agent inherently means that the app is built any more rigorously. Sure, it might be. But it's not guaranteed that a human app is more rigorously built than one guided by human, or vice versa. It depends, on the developer and how much they care, as it always has even before agents. I remember some shocking software from back in the day, Windows Vista being the top of that steaming pile. There's nothing new here.