Not advocating this, just more addressing the mindset on it, but in the game of office politics people don't mention concerns ahead of time because they don't want to give the opposing view point opportunity to research how to defeat their argument in a meeting, not that they "can't" give an intelligent response. They're choosing not to in their own self interest.
"The enemy must not know where I intend to give battle; for if he does not know where I intend to give battle, he must be prepared in a great many places. And when he prepares in a great many places, those I have to fight in any one-given place will be but few."