If it's working for you I have to assume that you are an expert in the domain, know the stack inside and out and have built out non-AI automated testing in your deployment pipeline.
And yes Step 3 is what no one does. And that's not limited to AI. I built a 20+ year career mostly around step 3 (after being biomed UNIX/Network tech support, sysadmin and programmer for 6 years).
Yes, I have over 2 decades of programming experience, 15 years working professionally. With my co-founder we built an entire B2B SaaS, coding everything from scratch, did product, support, marketing, sales...
Now I am building something new but in a very familiar domain. I agree my workflow would not work for your average "vibe coder".
And yes Step 3 is what no one does. And that's not limited to AI. I built a 20+ year career mostly around step 3 (after being biomed UNIX/Network tech support, sysadmin and programmer for 6 years).