You'd completely missed what I said up there. Open-backed is no excuse. The Abyss Diana V2 is $4000 USD (less than an LCD-5). It weighs the same or less, it is open backed, and having demoed their Diana series (a few models) and their flagship as well (also open backed), I heard better sub bass than I've heard on 90% of close back headphones. While EQ can mitigate some of this it's not always accessible or ideal if you are using headphones in multiple places. For example, if I go to another studio I'll want to use my own headphones to hear mixes, for reference. If I require EQ to make them viable, and they don't have it, I'm out of luck. No, bringing an amp with EQ in it, or an EQ device I have to plug them into isn't portable or practical. I'm not bringing multiple cases, various interconnects, just for that.
I want cans that'll have sound I want as they are, plugged into anything that drives them well enough (headphone outs, found in most quality studios, be it from their interface, headphone amp or mixing consoles, will have more than enough power, and be very flat, and honest). If this was to be some kind of stay at home listening in my favorite chair setup, sure, having EQ in line is easy enough. The idea of these being promoted by Manny is to sell them to those in studios, or using headphones for mixing and mastering in various places and setups. The idea of multi-thousand dollar cans needing EQs, to just give you enough sub bass to actually hear it, makes these obtuse. Remember, these are constantly lauded for sub bass extension & power, without EQ being mentioned as how you get it. That is my issue.