A highly cohesive software development team is deciding on a new architecture for a critical application. The team's influential lead architect proposes a novel, high-risk approach. Enthused by the architect's confidence and the innovative nature of the plan, the team members quickly and unanimously agree. They dedicate all subsequent meetings to refining the details of this single approach, without discussing what they would do if their primary assumptions about performance and scalability turn out to be incorrect. Which statement best evaluates the primary weakness in this team's decision-making process?