This need not be the case.
Committees play very important roles for organizations of all sizes.
This is also true of advisory boards or committees. The chair must have good communication and leadership skills. The chair needs to be a good facilitator, be well-organized, and have the time to commit to the committee's work. A good chair knows how to empower members through encouraging participation and promoting brainstorming whenever appropriate. The chair needs to generate enthusiasm within the group, while keeping it focused on the main issues and progressing toward its goals.