I had a bias against EQ when I got into cans seriously in '16. Having a lot of kit building/modding experience on the room speaker side, I was happy to dive in with mods. My primary aim was HFM cans, and the HE-500/6 had a lot of enthusiastic modders that left a lot of records. And as I discovered - outside of the drivers themselves, HFM didn't and doesn't do much tuning of pads, headbands, cables, rear screens (of the round cups).
The downside of modding:
1. If not reversible/done poorly/not well known they can hurt resale
2. It's hard to get a mod to just effect the problem you want to address. Most often its a sledge hammer where a rock hammer would do.
The big upside:
3. There are mods that do things positively which no EQ or PEQ can not do - the fuzzor mod for the 6/500, and pads in general is an obvious one I am very familiar with.
Spent lots of time on the mods, and lots of time on PEQ, once I started using it. For those that don't want to spend a lot of time, and have digital PEQ available (and don't want to mess with mods) - that's the easiest/best way to get results. You could use settings from Oratory - I always check them, but I always alter them because: the settings under 100 Hz are heavier handed than the music was recorded at, and the 2.5-4k range is often a bit too pronounced (for me). Also, they only deal with FR issues - nothing about tamping down ringing, or unit-to-unit variation, cancellations/reflections from wide stators, vibrations of the cups, etc.
Some people tune by changing cables, DAC's - it's expensive, may not translate at all to new transducers and in room systems - new rooms. That's why specific room tuning for room systems, PEQ, and directed mods are more productive and predictable.
For me, neither alone is enough - so far. But if I do get one more 1.5-2.5k can, PEQ and easily reversable mods at most.