From Northern's latest post:
So don't stick doggedly to the words on your creative brief when someone suggests something better, or work off brief isn't just great, it's a better strategy. Don't dig you heals in if someone who doesn't have 'planner' in their job title, or from another agency or, a client, has a suggestion that's better than yours.
The job of the planner isn't to DO all the best thinking, it's to make sure the best thinking emerges. A crucial difference that is lost on too many. So leave your ego at home and remember that changing your mind isn't a sign of weakness, it's a source of strength.