Your intuition/thinking definitely lines up with how we're thinking about this problem. If you have a good definition of done and a good validation harness, these agents can hill climb their way to a solution.
But you still need human taste/judgment to decide what you want to build (unless your solution is to just brute force the entire problem space).
For maximal leverage, you should follow the mantra "Why am I doing this?" If you use this enough times, you'll come across the bottleneck that can only be solved by you for now. As a human, your job is to set the higher-level requirements for what you're trying to build. Coming up with these requirements and then using agents to shape them up is acceptable, but human judgment is definitely where we have to answer what needs to be built. At the same time, I never want to be doing something the models are better at. Until we crack the proactiveness part, we'll be required to figure out what to do next.
Also, it looks like you and Danvers are working in the same space, and we love trading notes with other teams working in this area. We'd love to connect. You can either find my personal email or shoot me an email at my work email: navan.chauhan [at] strongdm.com