i suppose it's a matter of moving up the ladder in different aspects.
the way i heard most headphones before hearing audeze was that they were trying to accomplish the same goal but messed it up some how.
if you had three different headphones that were very good but each had one single. different problem with them and then you fixed each ones problem then all three of the headphones would sound basically the same. detailed, expansive, tight, fast, separated and endless soundstage for dynamics to breath.
Audeze seems to not care to much about a headphone that fills in your mathematical hysterical tendencies to fix the problem headphones have and rather focused on pleasing your ears. hifiman seems more mathematically correct.
so someone newer to the hobby gets an audeze and wonders about these other refinements that other headphones have to offer.
then they might get an he-6 or 500 and like the more refined approach. or someone might go from an he6 and then jump to an lcd3 and find it to be more soothing.
i imagine the 500 to be a good mix between the he6 and lcd3. not the lcd2 as the treble on the 2 seemed like a poorly engineered tweeter on a loudspeaker to me.
however as i've learned there's still another tier above the 3's and 6's and i'm guessing in the world of headphones that is the air of the electro's.