[Answer] Why does Hu Shousong’s Principles of Automatic Control say that a step input is the most severe operating condition for a system?

[Answer] Why does Hu Shousong’s Principles of Automatic Control say that a step input is the most severe operating condition for a system?

Let me answer it simply with an analogy: if the input is like eating steamed buns, a person can handle eating one bun at a time, but stuffing five buns into their mouth all at once is the toughest test for a person.