I agree with you, if you're already a competent engineer, your productivity only is improved by orders of magnitude by using coding agents that are at this point producing very good code as long as you give it the right prompts and you test your code and remove any bugs... if the code tests and all the bugs are removed, what you've got is a working product that is hard to argue that it doesn't work especially if there's been a lot of QA done on it and there's no bugs....