> It sure isn't simply reviewing, or designing, so where is it ?

If I can shit out some vibe-coded thing over a weekend that does <useful thing> it means anybody else with the same tool can do the same thing. There is no value in the actual code itself -- the faster these models run, the more true that statement will become. In the not too distant future these things will run directly on silicone and operate at thousands of tokens a second. That means they'll iterate and explore something far faster than they do now -- mistakes they make will be fixed in seconds or perhaps milliseconds.

That being said my <useful thing> is likely only "60%" of what makes an actual product somebody would buy. It's finding the other 40% that is something I don't think that LLM's can solve. That requires human judgement and then knowledge of how to communicate that vision to your agents.

In short, I believe the challenge is knowing what to build that others would find useful. It's easy to crank out <useful thing> for yourself. Making something others can use is not. And that is, possibly, the bottleneck. But once these are fast and dirt cheap, (and that is a when not an if) the cost to iterate to something workable goes way down. Of course mumble mumble "no silver bullet" / "mythical man" month mumble mumble and all that soo......

I dunno... doesn't directly answer your question but it is what came to my mind anyway.