In early November 2026, multiple product teams linked their design systems to an AI builder, described a screen, and received a finished‑looking prototype that leadership praised. After two days of testing, developers discovered the generated code did not use the actual design system components and had to rebuild the UI from scratch, causing frustration on both sides. Yunhao Jiao later described this pattern in Forbes as the "prototype wall" – excitement in week one, concerns by week three, and abandonment by month two.
The hidden rework inflates engineering effort and delays product releases, eroding the speed advantage AI prototyping promises. It also creates a misalignment between design and engineering teams, increasing the risk of missed deadlines and higher operational costs.