IMO, there is a fair amount of. "Those who can do. Those who can't teach."

Sure, you can find some videos of people making a wooden clock online. It's much harder to find master craftsman making a watch. A few PHD students putting together an electric car vs. someone at GM actually designing a car. Home cook vs. Five Star Chef.

Granted, generally an amateur is fine. But, don't be surprised if there making several mistakes without noticing.