2. Company uses it, maybe even starts to rely on it for important business operations, and for a time the employee supports that app.
3. Bugs creep in, feature request pile up.
4. Employee either leaves the company or moves on to another project.
5. Pain
The key here is that the moving target will _never_ be "what can 1-2 people vibe code without any expectation of being the best at what it does?"
(Also: training people on bespoke tools takes much longer than training on configurations of standard tools. Imagine if you had to learn a new source control system at every job, like in the '80s.)