I don't see how it's any different. There are ways to measure which flavor profiles are suitable to the largest majority of people. That's what McDonalds and other fast food chains spend millions on research to find out. They engineer their food to taste good to widest range. Does that mean it is objectively the best tasting food? Of course not.
Most of these high quality headphones already are somewhere in the "vicinity" of harman, just like the Focal Clears are. I would contend that "more suitable to more peeps" isn't the highest metric of success here. These are products manufactured by designers who have an opinion and are creating a vision and experience to enjoy. Perhaps that vision doesn't align with you, that's fine. EQability is only one dimension of a headphone's performance. It can also be influenced by things other than tuning, such as the quality and distortion characteristics of the driver itself.
I EQ'd my Focal Clears to Harman, and for the first few minutes it sounded good. Then after a short bit, it began to sound fatiguing and headache inducing. With a driver which has these dynamics and impact, I could understand why Focal tuned these headphones the way they are. I experimented with many EQ profiles and find myself always going back to the original non EQ'd version which sounds way more natural and less fatiguing to me. I'm only one data point, but my point is it is important to try understand and appreciate these products for what the designer intended. Different flavors here, there's a chance to discover something you may have not known you enjoyed.