The pathogenesis of ADHD isn't completely understood, but hard evidence of consistent anatomical, neuronal, and chemical differences is only increasing. There is something real happening without much doubt - the task now is to figure out what and why.
Maybe I'm misunderstanding you when you say social construct, though. I'm not sure if you mean "ADHD isn't real" or "It's a bucket we throw similar types of disorders into". If you mean the latter, I'd agree - I wouldn't be surprised if in 10-15 years we see that sub types can be distinctly identified in some way. I have no idea if at that point we'll need to overhaul these categorizations, but, I suspect we will at least understand the pathology better.
[1] https://www.thelancet.com/journals/lanpsy/article/PIIS2215-0...
The idea that ADHD is some abberant way of being that ought to be medicated into a teleological more ideal way of mental being is also, completely, a human construction - you can't get that conclusion just by looking at brain blood flow or anything like that.
I do agree about it not inherently being a problem that needs to be medicated. I personally only use meds when I need to be more “normal” and cut through the fog that daily life and tasks seems to generate for me. Sometimes I will develop a backlog of tasks and it’s helpful to cut through it.
I get the feeling that I was born in the wrong place at the wrong time, so to speak. It seems ADHD is present but much more tolerated in some cultures such that it doesn’t cause the person with ADHD as much stress or anxiety as they grow older. Like you suggest, these people are just people and though they’re different in some ways, it’s still within the bounds of normality.
It seems to be once you put ADHD brains into uncomfortable environments that it becomes problematic. Otherwise there is plenty of potential for it to be advantageous in many ways.
No psychologist I've spoken to or read a book from has claimed to have a firm grasp on what ADHD is. They even admit the diagnosis is very much done "by feel", requiring as much history and cross-reference of family and friends' experiences to be certain.