So if you're going to build a massive application say, YouTube, Facebook or Instagram you're going to sit down, and write out every template, db model, controller, view model, etc in one single sitting for the entire application? No bathroom breaks, no lunch, no "I'll finish that part tomorrow" you do it ALL in one sitting? Because you will miss something, and that's my point, nobody gets their first crack at a greenfield project 100% in one sitting, you build it up to what it is. The AI is used the same way.