I would assume it is a "borrowed" practice because it was Hakuin who organised the Rinzai curriculum in the way it is today with many levels of koans.
The guy didn't really say that there was a curriculum, just that he went through the major collections.
Seung Sahn's gates are also not really a curriculum in a sense that there is no set sequence. You can get anything anytime.
I was not really referring to the question of sequence, just to the fact that I always thought that Koreans would rather spend 30 years focusing on "What is this?" rather than giving answers to many gongans.