I see it more akin to adjusting your suspension settings to suit the quality of the road surface that you're on. Most headphone users will EQ their cans, some even have genre or song specific EQ to compensate for issues with the original production, or to boost/cut frequencies that are predominant in a given genre. I also have a pair of M50X's that have to be EQ'd when listening to heavy electronic music as you can't hear yourself think! That is totally down to the amount of compression used in EDM/dance/IDM, which is used to make the recording sound better and louder than it needs to be. Some producers/sound engineers did a fantastic job (check out pretty much any Steely Dan album), and others seem very lazy.