That's my hunch as well. In another society, peoeple "with ADHD" would actually be deemed normal and well-adjusted, while drones who want to go to the same job for 40 years would be medicated. It just happens, that in civilized societies, specialization and consistency give huge payoffs, so we medicate people who can't naturally do that.
This pattern alone is absolutely not enough to suspect it's ADHD. Several other factors need to be present.
In general during diagnosis (I can attest to Germany), it must be credibly shown that multiple symptopms have been present both during child as well as adult age.
Typical patterns are several aborted apprenticeships or studies, inability to hold steady employment over several years, problems with romantic relationships or long lasting friendships.
At this point (2022), we know ADHD has a genetic component. The "Hunter versus farmer hypothesis" is the most prevalent anthropological hypothesis (non-medical) about the historical positive/negative selection pressures for ADHD traits. https://en.wikipedia.org/wiki/Hunter_versus_farmer_hypothesi...
The tl;dr is that we think ADHD traits had positive selection pressure for 90% of human history, which is why ADHD is so common. ADHD is actually believed to be dramatically under-diagnosed in certain population slices, like adult women, because the diagnostic criteria was developed based on predominantly male/child subjects.
In the context of scouting for a nomadic hunter-gatherer tribe, ADHD traits seem like a gift.
In the context of modern American society, ADHD traits can lead to strong negative experiences spanning education, career, and relationships. In some contexts (like entrepreneurship), ADHD traits can still be a gift - but I'd hazard a guess that percentage-wise, a larger % of the ADHD population winds up in prison vs. becoming an entrepreneur.
Similar to autism, ADHD is a spectrum neurological disorder. "Disease" is the wrong term to use; "disorder" is the correct medical term. ADHD traits become a disorder they have a negative impact on development (childhood) or negative impact on well-being as an adult.