I agree, that stakeholders play a huge role in projects. Since the “stakeholders are all the people involved in or affected by project activities” (Schwalbe, 2015), sometimes it may be hard to identify all the stakeholders at the beginning of the project. The more stakeholders can be identified at the beginning of the project, the better the project can be managed. Sometimes, failing to identify critical stakeholders (i.e. opponents) can lead to a failure of the project or to significant project delays. One famous example that comes to mind is the Keystone Pipeline. This project has begun, but didn't take all the stakeholders into the consideration, which resulted in project delays and possible failure to finish the project.
