This study doesn't demonstrate that. I personally fail to see how someone with a critical lack of executive function can have an easier time surviving in the wild, dangerous, ancient world, compared to now. Or extreme inattentiveness, where not noticing a snake on the ground or a lion in the bushes likely means the end of you. But sure it's an interesting idea to think about.

It demonstrates perhaps that individual exploration is good for eventual tribes. Finding greener pastures is good, no? It’s not like you’re in it all alone, it’s a community with different strengths that cover for eachother. Different classes for a good RPG team, everyone knows that

Cats have ADHD, dogs can learn to focus and sit still. Do you think cats would survive better if they were more like dogs? I don't think so, they are good at different things.

But human society has had much more use for dogs than cats, people who can focus and follow orders reliably are just much more easy to scale.

In the modern setting, people with ADHD are far more likely to have sex with strangers, so perhaps a similar effect contributed to past evolutionary success.

I thought inattentiveness in ADHD manifested itself as being easily distracted, therefore not paying attention to the human that they should be listening to (which makes the other human upset). Ie they would perhaps be more likely to notice the snake or lion, because they're paying more attention to the environment.

"Easily distracted" is a flawed description - it's pretty much how it appears to parents of children with ADHD when they don't focus on something the parent wants them to, but from the perspective of a person with ADHD it's more like "no agency in directing your focus". So, no, you can certainly miss the snake or lion because all your brain resources went into analyzing patterns on a leaf instead of listening to the human that's now getting upset.

In fact, people with ADHD are usually more focused and harder to distract than other people - as long as they do something actually interesting to them.

I imagine society would rather implement something like eugenics than change for our benefits.