The textbook ideal regulation is zero in the same way that a textbook ideal operating system costs no ram, takes no cpu cycles, or consumes and disk space. Rea

The textbook ideal regulation is zero in the same way that a textbook ideal operating system costs no ram, takes no cpu cycles, or consumes and disk space. Reality is more complicated. And once you incur the cost of reality there's probably some things that you should bundle with it for convenience and consistency.