Controlled dissension should be welcomed. Commitment is a must once the leader decides to put his foot down on the next steps forward, though. Nothing can ever be perfect, but this ideology should be articulated as such. You either swim together or sink together!
From Netflix:
After a decision is made, we expect everyone, including the people who argued for a different approach, to disagree then commit. This helps ensure the outcome is as successful as possible. Afterwards, when the impact is clear, the informed captain should reflect on their choices — what worked and what didn’t — so everyone can learn how to do better next time.