I think the mistake there was the 5 hour session specing the app. It's so hard to know what you want before you see it, so optimize towards seeing it as soon as possible. That's what I thought the article was going to be about based off the title.

Once you have something concrete you can iterate on the prototype until it's a mess. But, hopefully, in that time you got closer to figuring out what you want. And even if the code for the prototype is a mess the "idea" of it should be cleaner. I like to have an LLM make a new spec at that point, and start fresh with it. You can clean up the abstractions and the UX there.

When writing code is cheap figuring out what you want to write is the hard part. It always was, but the barrier of getting the code written and working made that less obvious.