Or, using more LW terms, creativity became a lost purpose in education.
Agreed. Robin Hanson has a good article on why creativity is overrated. "Critics complain that schools squelch creativity, but most people are inclined to be more creative on the job than would be truly productive."
A blog post by Alistair Roberts, as curated by Steve Sailer. (Steve's version is shorter and more targeted; the original blog post is the fourth in a series on triggering and suffers for its reliance on the particular issue.)
It seems like a very useful dichotomy, and strongly reminds me of Ask and Guess.