You don't need the room looking at you.
You had the answer eight minutes before it got said out loud, by someone else, less precisely.
Your silence gets read as agreement. You were thinking.
You let the best idea win instead of the loudest one.
You want to be asked, and the people who most need your read are the least likely to think of asking.
… decisions are written down, groups are small, and someone asks for your read.