I feel a bit bad quoting Jim and him taking flack for it, so here is a link to his website for anyone interested in what he does. I figure a bit of free advertising makes amends? lol
He basically says if anyone believes that test equipment can tell you how something will sound, then sure, design your equipment that way, but even the makers of the best test equipment in the world have never claimed their equipment can tell you how something will sound. He uses test equipment for what it is for, to check for errors in designs, but then uses his ears for if it sounds good. He also says the makers of test equipment have never claimed everything in audio can be measured.