I don't disagree, but you have to remember this is a game at its core and while you enjoy hyper realism, others may not care to do it by the book and just want to enjoy the game. On busy servers like Through the Inferno, I'd prefer people with little experience tank with the AP on if it gets them done tanking quicker so the line of people waiting can enjoy their game too.
As I pointed out above, it's also fantastic at isolating the multitasking required to tank safely and can make the learning experience faster and less stressful. It helped my throttle work ten fold and now I'm focusing on doing it without AP on because I feel more confident enough in my throttle management to focus on joy stick work.