Neutral is boring and doesn't move on the sales floor to the average punter. The "Harman" preferred target is all about selling headphones to the masses, nothing more and nothing less. The reasons headphones like Harman's AKG 5/6/7xx aren't much sold in big box stores is they are more neutral and suited to people want a more accurate rendition of the actual recording, instead of a 1970s loudness contour that makes everything sound like a disco in your head. I mean, look at the world-wide success of Beats in the noughties.
At least the 1970s loudness contours were level sensitive and decreased as you approached the halfway point on your volume dial (50% loudness tap). Equal loudness curves anyone? To me, baked-into-the-product loudness contours, with sharp low and high cut filters like the "harman curve" are an absolute anathema to high fidelity reproduction. Neutrality is thrown out the window, sacrificed at the altar of sales success.
Audiophiles would be much better served with ostensibly flat headphones and variable loudness contours like Yamaha has incorporated for many decades into their products. Being a wholly subtractive and infinitely variable contour it's designed to closely track the equal loudness contours and doesn't result in overdriving amplifiers or drivers like EQ often does.