In Agile, it's important to maintain focus on the current sprint's goals and scope. Since the sprint deadline is approaching, adding additional features may compromise the team's ability to deliver the planned work on time. The best approach is to explain to the client that the new features can be considered for the next sprint, ensuring that the team can finish the current work and deliver value on time. This also allows the team to properly plan for the new features in the next iteration without overloading the current sprint.

The root cause of the issue seems to be a focus on process and planning meetings, which may be impacting the team's ability to deliver effectively. Implementing Kanban, which emphasizes a pull system and focuses on continuous delivery without overwhelming the team with unnecessary meetings, allows for smoother workflow and can address bottlenecks. It helps the team focus more on value delivery rather than rigid planning and process constraints, thus potentially improving the quality and reducing unnecessary delays.