1. The person I'm replying to is hypothesising about a future, not yet existent, version, GPT5. Current quality limits don't tell you jack about a hypothetical future, especially one that may not ever happen because money.
2. I'm not commenting on the quality, because they were writing about something that doesn't exist and therefore that's clearly just a given for the discussion. The only thing I was adding is that humans also need guidance, and quite a lot of it — even just a two-week sprint's worth of 15 minute daily stand-up meetings is 18,000 words, which is well beyond the point where I'd have given up prompting an LLM and done the thing myself.