But you and the parent are both ignoring that, in the real world, prototypes constantly (in fact, nearly always) get shipped straight to production and not updated or rewritten, precisely because they solve a pressing problem, and if they solve it well they get real users right away who start bringing up new feature requests and bugs before the prototype can ever be fixed.

This was a constant pattern in software engineering even before LLMs, but LLMs are making it much worse, and I think it's very head-in-the-sand behavior to ignore that. It's akin to going "well, you can't blame the Autopilot because the person should have been fully-attentive ready to react at any millisecond". That's not how humans work, and good engineering is supposed to take real-world human behavior into consideration