I disagree. I never said anything about teaching everything you know. I can explain to someone why a certain metal in a product is better than a less expensive

I disagree. I never said anything about teaching everything you know. I can explain to someone why a certain metal in a product is better than a less expensive metal without getting into advanced materials science/crystal theory yet not use hand-wavy 'You wouldn't understand' language or mentality. Pretty much anything I can think of, as long as you're willing to spend five to ten minutes on explaining it, can be discussed with a person without the same background. That isn't to say at the end they could or should be expected to be able to build a bridge safely, but at least the can understand why it's costing them so much.