The end user is best positioned to verify that prioritized requirements will deliver value from a customer perspective because they directly interact with the solution and experience its outcomes. Their feedback ensures that the requirements meet usability, functionality, and satisfaction expectations.
While other stakeholders like the sponsor or domain SME validate alignment with business goals, the end user focuses on practical, value-based utility.
BABOK Reference:
Throughout the BABOK, particularly in Requirements Life Cycle Management and Solution Evaluation, the role of the end user is emphasized for validation and feedback based on real-world use.