The arrogance is astounding. The vast majority of people you're talking about have absolutely no interest in studying in those fields. Those that try and fail, were unable to create/learn the inexplicit knowledge required to understand everything. That does NOT mean they cannot, in principle, create/learn that requisite knowledge, merely that they failed to do so. When someone makes an error, we never assume they are doomed to forever make that error. We can correct our errors. There is absolutely no difference between a simple error correction, and an extremely large complex error correction, except for scale. If someone can understand explanations for one thing, there is nothing, in principle, stopping them from understanding anything else. You're essentially advocating for supernatural thinking. That there is some special magical thing about complex explanations that means only certain people with special intelligence can understand. That is just not true. We are universal intelligences, and given enough time, anyone can understand anything. I readily admit that some people are quicker and more efficient at understanding, whether it be because of the inexplicit knowledge they create as young children, or because their memory and processing power is higher. But taking much longer to understand something is very very different from being in principle unable to ever understand something. Unless someone is severely disabled, they are universal in their ability to understand.