Consensus may often be seen as the most efficient, democratic way to reach decisions, but it is far from perfect. It can lead to groupthink where decisions are made solely for the sake of conformity instead of being based on evidence or sound reasoning.
As a result, consensus-driven approaches can easily be manipulated by people with persuasive personalities who are able to convince others of their points of view regardless of their merits. In addition, consensus can become time-consuming and leave little room for criticism from outside sources that could otherwise provide valuable insight into any topic.
While consensus is a good way to reach an agreement between parties, decision-makers should always approach its outcomes with caution. It works well if an reaching agreement in your group is more important than achieving a certain result.