In my experience, the environment/culture has not been established that welcomes stakeholders – OR their input! They have had negative experiences with being overlooked, drowned out or witness to ineffective processes. Stakeholders often feel projects are done TO them rather than WITH them
The best way to increase stakeholder engagement that results in information sharing is through a skilled facilitator that utilizes tools seamlessly to draw in, level set, solicit input and prioritize the input in such a way that everyone has had full opportunities to participate.