CAPM Practice: Determine how to follow and execute planned strategies or frameworks

A project charter has just been approved for a new software implementation at Paragon Projects. Arjun Horvat is the project manager. During a meeting, a team member asks why they need to follow the communication plan that was developed during planning. The communication plan requires bi-weekly status reports to all stakeholders. The team member suggests sending updates only when there are major milestones instead. How should Arjun respond?