Changes in projects are often seen as an unpleasent disruption. I often experienced that much emphasis is put on fighting the changes, or that changes are utterly ignored.  I think that project management and changes cannot be separated. Changes are chances for development, which must not be wasted.
I have been working in projects for 20 years and employing different approaches like systemic approaches, group dynamics and agile approaches in project management.
Success is not reached by employing the best methods but by finding the right mixture between those methods that are accepted by the team and the organization.