The demo that worked, and the product that didn't
You opened an AI tool, typed what was in your head, and watched a working screen appear in ninety seconds. It felt like magic. It felt like you'd just skipped six months and a team you couldn't afford.
Then you asked for the second feature. And the third. Somewhere around the fifth prompt, the thing started fighting you — buttons that used to work stopped working, the data model contradicted itself, and every fix broke something upstream. The demo that dazzled an investor on Tuesday couldn't survive a real user on Friday.
This is the quiet failure mode of the AI build era, and almost nobody warns you about it. Vibe coding ships prototypes. Spec-driven ships products. The gap between those two outcomes isn't talent or budget — it's what you did, or didn't do, before you wrote a single line of code.