I'm not disagreeing with you, but I'm starting to wonder what "warm" really means, or perhaps what "neutral" really means. To me, slightly "warm" phones sound like the real thing to me much more than a "neutral" phone does. In the real world, treble information gets absorbed much faster than lower frequencies so, to my ears, the real world actually sounds slightly "warm"
To me there's bright side of neutral like HD800 and AKG 701 and warm side of neutral like LCD-3F. There's ver few headphones that are dead center neutral.
I personally like the warm side of neutral.
Neutral that has a ever so slight boost in the mid and upper bass complemented by a every so slight boost in the mid and upper mids and slightly rolled off lower and upper treble.
That's my dream phone.