ah, don't argue, doesn't mean don't disagree. It means you don't get in a yelling match with your ego's on the line. You will say things that should not be said, that have nothing to do with what you are trying to discuss. Don't discuss important things while you are mad, it is not good for anyone.
discussing your disagreements is good. It helps work out a path for everyone to go down together. But getting into a yelling match, arguing. Just gets people mad and then they don't listen. (how can you listen when you are both yelling at each other?) also in that state what little you do hear you will take personally instead of taking it as criticism of your stance on the topic.
so my statement is when you disagree, discuss it. Don't make it personal and don't take it personal.
In my family, my wife runs things. Reason is I work to much, not around as much as I should be and when I am half of that time I am asleep (I work nights for my main job). Back when I worked 15 hour days, I just was at home long anough to eat, sleep, shower and back out the door. Having one parent be in charge kept things stable for the kids. We didn't have time to argue either, the little time we had, was spent together. .