Depending on what you're working on, they are already at that point. I'm not into any kind of AI maximalist "I don't read code" BS (I read a lot of code), but I've been building a fairly expensive web app to manage my business using Astro + React and I have yet to find any bug or usability issue that Claude Code can't fix much faster than I would have (+). I've been able to build out, in a month, a fully TDD app that would have conservatively taken me a year by myself.
(+) Except for making the UI beautiful. It's crap at that.
The key that made it click is exactly what the person describes here: using specs that describe the key architecture and use cases of each section. So I have docs/specs with files like layout.md (overall site shell info), ui-components.md, auth.md, database.md, data.md, and lots more for each section of functionality in the app. If I'm doing work that touches ui, I reference layout and ui-components so that the agent doesn't invent a custom button component. If I'm doing database work, reference database.md so that it knows we're using drizzle + libsql, etc.
This extends up to higher level components where the spec also briefly explains the actual goal.
Then each feature building session follows a pattern: brainstorm and create design doc + initial spec (updates or new files) -> write a technical plan clearly following TDD, designed for batches of parallel subagents to work on -> have Claude implement the technical plan -> manual testing (often, I'll identify problems and request changes here) -> automated testing (much stricter linting, knip etc. than I would use for myself) -> finally, update the spec docs again based on the actual work that was done.
My role is less about writing code and more about providing strict guardrails. The spec docs are an important part of that.