PMP Practice: Examine the business value throughout the project

Nari Jeong-Tanaka is managing a project for Delightful Chaos Labs to upgrade their entire warehouse management system across 47 distribution centers. The project has a fixed regulatory compliance deadline in 18 months, a detailed scope validated by legal and operations teams, and requires integration with legacy systems that cannot be changed. The implementation sequence must follow a specific order due to data migration dependencies between facilities. During a project review, a team member suggests switching to an iterative approach with two-week sprints to 'deliver value faster' and 'be more agile.' The sponsor is intrigued and asks Nari for her recommendation. What should Nari do?