v0 plus Figma plus Cursor: interactive prototype shipped in one afternoon

v0 built a contacts table with search and a modal in three minutes flat, then took fifty more to wire up anything that actually makes it a product. That ratio is the whole game: AI scaffolding is instant, but brand decisions, interaction bugs, and demo-path triage do not compress at the same rate. The founders closing rooms on Monday are the ones who made their design decisions before the first prompt, not the ones who delegated them to the tools and tried to recover later.