Harman incorporates a dip in the upper bass-lower mids, which is part of where the 6X0 line gets it’s beloved vocal tonality/characteristic.

I personally don’t find Harman bad, but it’s not quite my actually preference. Tad bassy, tad lean /pulled back in the mids, and a tad sharp around 10-11k for my ears. It feels kind of like a step towards v-shaped/U-shaped, and I like my mids too much for that.