I'm every bit as immersed in this as you are. I've been developing my own custom claude code plugins that allow me to delegate more and more the agents. But the one thing the agent is not reliably doing for me is making sound architectural choices and maintaining long term business context and how it intersects with those architectural choices.

I tried teaching all of that in system prompts and documentation and it blows the context window to an unusable size. As such the things that as a high level experienced senior engineer I have been expected to do pre-agents I am still expected to do.

If you are eliminating those people from your business then I don't know that I can ever trust the software your company produces and thus how I could ever trust you.

Finding edge cases is completely orthogonal to creating maintainable software. Finding edge cases ~= identifying test suites. Making software maintainable ~= minimizing future cost of effective changes.

Ignoring future maintenance cost because test suites are easier to create seems like disjointed logic.