Invention and comprehension through Socratic guidance are different tasks, with wildly different levels of difficulty. It's just not accurate to pretend that students are expected to "come up with" these theories in anywhere close to the way that (eg) Newton did.
Correct, but perhaps not in the way you are thinking.
Newton was something else, but still: he had acquired a vast amount of knowledge and insight upon which he built his new theorems.
Meanwhile, experts are notoriously good at forgetting what it is like to not understand something yet, so when explaining things they subconsciously presume more a priori knowledge than is appropriate.
