Sure, many companies suffer from the "herding cats" problem and could use more cohesion. But there are also many companies that suffer from excessive groupthink

Sure, many companies suffer from the "herding cats" problem and could use more cohesion. But there are also many companies that suffer from excessive groupthink, and would be better off with more people going against the grain. You can't say that one advice is universally better than the other, you need to look at the specific company.