Maybe they don't know what the hell they're talking about. Some time they told me that if I knew something, I had to know how to explain it with pears and apples, and that if I couldn't do that, I really didn't know what I was talking about. And if it is a very complex subject you can always use examples, fables, parables, allegories, and the like, there is always a way to make the complex simple.

That is also an alternative.

But what do I know?