Principles are ways of successfully dealing with reality to get what you want out of life.
Ray Dalio, one of the world’s most successful investors and entrepreneurs, cites principles as his key to success.
Working oneself through disagreements can be time-consuming, so you can imagine how an idea meritocracy--where disagreement is not just tolerated but encouraged--could become dysfunctional if it's not managed well. Imagine how inefficient it would be if a teacher ran a large class by asking each of the students individually what they thought, and then debated with all of them, instead of conveying their own views first and taking questions later.
People who want to disagree must keep this in mind and follow the tools and protocols for disagreeing well.