It's not just that students know less than experts; it's also that what they know is organized differently in their memory. Expert scientists did not think like experts-in-training when they started out. They thought like novices. In truth, no one thinks like a scientist or a historian without a great deal of training. This conclusion doesn't mean

There are at least two reasons why experts struggle to give good directions to beginners. One is the distance they’ve traveled—they’ve come too far to remember what it’s like being in your shoes. It’s called the curse of knowledge: the more you know, the harder it is for you to fathom what it’s like to not know.

When they’re tapping, they can’t imagine what it’s like for the listeners to hear isolated taps rather than a song. This is the Curse of Knowledge.