alt Hacker NewsAI is going to make, long term, Software Engineering more important. Getting requirements, user feedback, tests, product vision. These are key differentiators now.
If you can really get a good set of requirements, go and write all of your test cases out, and then throw it at an AI that will one shot it. Its perfect.
You're basically describing a waterfall process. That never worked in a pre-AI world and won't work in an AI world. Why? Because it's just not possible to gather absolutely every requirement up front. Software development has always worked well as an iterative process. You come up with better solutions as you go along and learn about the problems you're solving and make improvements. While AI will be able to one-shot a set of requirements, you'll miss out on those improvements because you'll have skipped over those phases.
I've tried this out. Even with relatively small applications and with spending hours reviewing the spec documents, there was always something I missed or something that wasn't quite right when seeing it live.