Sure it makes sure that the x% of employees who don't get the nuance won't ask questions about it, but it prevents ambitious employees from learning how decisions are made at higher levels.
Understanding how the organization makes decisions can help you make decisions in your day-to-day work. Not to mention the fact that if you one day have aspirations of leading an organization, you need to understand how decisions are made. When over-generalized public statements are made, it not only conceals this information but corrupts it and can lead people to false understandings of how things are done.
Some of the best insight I've gotten about why my organization and my company makes the decisions it does have come from reading discussions from senior leaders in google doc comments. I wish I could be a fly on the wall for live meetings or private conversations.
In the optimal company, employees who don't want to have to grok the nuance would be able to trust the decisions of the leads. However all decisions should be made in the open so that those who do want to go to the effort of understanding something can learn.