Comment by beyarkay
(author here) This is an interesting point. I hadn't considered it, but I agree. Or maybe to be more specific, I think the novice has some prior that their idea will work, and hearing an expert's disagreement will update their prior somewhat. If the novice has a high respect for the expert, that update will be large enough. But sometimes the novice just has to experience the pain firsthand in order to truly appreciate why something is a bad idea.
Advice while struggling is the key. I mentor a few friends, but if I'm giving directions, it is kept vague so that the task is still done by themselves. A proper review is only done after they tried or completed the tasks. This way, they already know the scope of the problem so the solution is way more understandable.