I agree with you. However I'd say leading with, "You are wrong" is risky. Unless you have a very good working relationship with them, always start with empithy and praise. "I think this will really work well for our clients. How do you handle 'reason they're wrong'?"

Obviously, do what the situation calls for, but I pissed many people off, without being wrong, telling them they are. I found really looking at it from their point of view first helps. Usually they're trying to solve a real problem, so at least take the time to understand it and how they see it.