Vibe coding has a ceiling. Here's exactly where it ends.
AI-assisted coding tools are genuinely faster for the first eighty percent of a feature. The last twenty percent is where the bill comes due.
Prompting a coding assistant to scaffold a feature, wire up a UI, or generate a first-pass API is now faster than writing it by hand, and pretending otherwise wastes a real advantage. The tools are good at pattern-matching against the enormous amount of code they have seen, and most features are, structurally, not that unusual. That is the eighty percent that vibe coding genuinely accelerates.
The other twenty percent is where the codebase's actual constraints live — the edge case a tool has no way to know about, the data model decision made for a reason three sprints ago, the security boundary that has to hold even when the request looks normal. AI-generated code tends to be locally correct and globally unaware. It compiles, it passes the obvious test, and it quietly reintroduces a bug the team fixed last quarter because the assistant never saw that fix.
We use these tools constantly and still put a senior engineer's judgment on every pull request, because that is the only checkpoint that catches the twenty percent. The studios that skip that step ship fast for a few months and then spend longer than they saved untangling code nobody on the team actually understands. Speed without ownership is not a shortcut. It is a loan.