Let's take the 560S for example. If you're someone who is totally fine with the bass quantity on these cans, and your unit in particular has a trebel peak that isn't crazy high and sounds natural to your ears, wouldn't EQing possibly introduce more harm than good?

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For reference, my 560S sound pretty good stock. The bass is nice, and they overall sound natural yet clear. If I apply the Harman EQ target from Oratory, which I think is supposed to tame the trebel a little, it actually increases the trebel amount in my particular case, so I end up having to reduce the 9th band from 2.5dB down to 0.5dB otherwise high hats and snares are unbearable. BUt after turning EQ off, and the energy in the top end goes back down, things are totally fine again.

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So in my case, it seems like introducing EQ into the mix actually harms my particular pairs sound. Which I can fix by reducing that band, but at that point, why bother? Because if I simply disable EQ, it's totally fixed again.

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With this in mind, I'm sure the reason this is the case is probably due to unit variation, and I might have just simply gotten lucky with my pair of 560S and they might just match a little more closely to Harman than the stock pair, so perhaps the EQ is overcompensating for this? And if that's the case, is it just better to use EQ if you either notice issues with your FR, or if your headphones just don't match up with harman that much?