50 years ago there were not that many people with type 2 diabetes because people ate less and moved more (at work and at home).
A couple scores were still quite low at the 15th and 22nd. Those are clearly issues for me as well, though nowhere near as much. I don't know, I think this stuff makes a meaningful difference. For the cognitive attributes I scored far higher in (high 90s in some cases), it's abundantly clear what a disadvantage many people are at in that regard. Even someone scoring closer to the 50th.
You could say it all balances out, but it doesn't seem to. The high scores I get are all undermined significantly outside of test settings. Major deficits have a serious toll on you. I'm not complaining at all, though. To me it's a fact of life, something to accept and address (with behavioural interventions as you mentioned), and try to find strategies to move forward. You get what life gives you. Generally speaking, it could be a lot worse. I'm very grateful for the parts of my brain that work well.
i have been diagnosed as having ADHD multiple times, both as a kid as well as an adult. my parents decided not to put me on drugs, and as an adult, i have found behavioral interventions to be the most useful. i have not found perceiving it as a disability to be very helpful.