I agree, inasmuch as not everyone's hearing is the same. Take me for example. I have significant hearing loss in both ears thanks to repeated exposure to guns, cannons and explosives. To compound that, my right ear's more gone than my left. Therefore a system set flat sounds like a dog fart to me. Therefore I set up a system that sounds good to me, despite having the loudness on and the EQ on my head unit heavily tweaked.

But that's just me...