I don't think he asked for every defense for every type of hook. There is more than one type of hook you know.
As for you don't agree and it's not realistic are you talking about using a punch inor fora defensive manner, to intercept (jeet?), disrupt his structure and range and take away his timing.
My answer to both of these is watch a boxing match either with a good boxer who has a good jab. Ali, Sugar Ray (either of them), Sonny Liston or Larry Holmes. The jab is always there. Or a good infighter: Joe Frazier, Rocky Marciano or a young Mike Tyson. Fighters who control their opponent by swarming aggression, close distance and vicious body punches. Two totally different ways of using the attack to provide defense.For your final question: "Who spars attacking all of the time and preempting everything the opponent's got, never worrying about defending?"
The answer is a good boxer and this includes Chinese Boxing also.