Interesting. I’ve not tried Audeze for many years, I forget the model.
I saw he shared FIR files for people to try, for AKG K371 so I tried them.
When I compare to my dead neutral Genelec speakers 1m from my ears, oratory is easily the most neutral sounding to me. Same tonality as my Genelecs which are my reference for neutral “out of the box”. So Harman curve EQ for my AKG works nicely to achieve the goal of sounding like neutral speakers in a typical room.
oratory1990 shares some ways to adjust bass or treble to preference (the low and high shelf filters), so you don’t have to be stuck with just Harman (although Harman’s user preference findings were actually a plot range, not just a single plot).
But as you say, maybe different for different model headphones.