"People have tried lots of different ways to run militaries. It is one of the areas where I think Golarion is actually most - uh, the reasons for things will be better with militaries than with most places? Because armies that have bad policies lose and so having better ones is easy to check and highly motivated. And one of the things that is understood to be important for running a military is discipline, the strong expectation that your soldiers will obey orders, even orders that they don't understand, even orders that will get them killed. A lot of maneuvers only work if all the soldiers do exactly what they're told. And part of having a disciplined military is having rules about how you address superior officers and how you raise complaints when you have them, and about discouraging - a failure mode where your soldiers are constantly complaining about and mocking their superiors and as a result arrive at mutual knowledge that they won't necessarily listen to orders.
I assume that dath ilan if they had this problem would just say, well your soldiers will only arrive at common knowledge if it's good that they do that because their commander is genuinely bad, but in Golarion, they will arrive in that state approximately no matter what, and then you'll lose the war, and the commander probably was bad but the demons are literally going to eat us all."