Most new ideas that human beings come up with are wrong, and if someone just thought of something five seconds ago and excitedly wants to tell you about it, probably the only benefit of listening is not offending the person.

This doesn't jive well with my intuition about conversations being good ways to shape new ideas. It's very common for conversation participants to state their ideas aloud without having even thought about them for 5 seconds. Maybe if we were all robots sending signals to each other using TCP/IP then it would be good for each individual robot to spend a certain amount of processing power on an idea and ensure basic soundness before sending it to other robots in the network, but humans can't flip on excitement like a switch. Excitement is valuable, and conversations about exciting topics are a good way to generate it artificially.