LLMs by their nature are not goal orientated (this is fundamental difference of reinforcement learning vs neural networks for example). So a human will have the, let's say, the ultimate goal of creating value with a web application they create ("save me time!"). The LLM has no concept of that. It's trying to complete a spec as best it can with no knowledge of the goal. Even if you tell it the goal it has no concept of the process to achieve or confirm the goal was attained - you have to tell it that.