Well, engineers are kind of the archetypal model of the "but ackshually..." guy, so I'd venture to say you're right. I used to be more bold in my pronouncements when I was younger, now I think I like to repeat stuff I've heard like "interesting, I had heard that X was a factor with this, do you know if that's true or not?" In these situations. Having some intellectual humility and actively seeking opinions of people who might be more informed goes a long way.