Wow thanks for the very detailed explanation, mate, that is much appreciated. However, I still wish the author had delved into more real world examples, to let us have more sense of how this principle can be applied into more practical use cases. "Algorithms To Live By" https://www.goodreads.com/book/show/25666050-algorithms-to-l... did a really good job at that. Of course an article cannot be at book length but a man can hope.