One of the reasons that supports the need to govern Enterprise Architecture is that best practice governance enables the organization to control value realization6. Value realization is the process of ensuring that the expected benefits from implementing an Enterprise Architecture are achieved and sustained over time6. Best practice governance provides a framework and mechanisms for monitoring and evaluating the performance and outcomes of Enterprise Architecture initiatives, as well as ensuring alignment with strategic objectives and stakeholder expectations.

https://pubs.opengroup.org/togaf-standard/adm-practitioners/adm-practitioners_15.html In short, the implementation team is directed to create changes with intentional value-based outcomes. Best practice governance enables the organization to control value realization.