But some regions/cultures are lagging (but catching up fast) as per my experience living in 5 states across 3 countries spanning two very different continents.
So, your life is sprinkled with unhelpful people that mean well but think you're just not listening to them.
And you yourself think, your too dumb or lazy or whatever to get things done consistently.
The you find out it's ADHD and you learn different methods to get things done. Which is nice.
But it's also very sad if that happens years after childhood. Because you realise, you might had a more successful life if you knew earlier
YMMV, maybe other individuals need confirmation/closure on the topic in their lives to help them move onto the next chapter? Knowledge is power.
(Post-comment reflection: this is needed in a lot of other aspects in life, why not here as well?)
The only way it does make sense is if you think the consequences should be different because some doctor give it a name. But then you say nobody should have been treated that way regardless of the diagnoses. If the diagnoses doesn't matter why does it matter?
As someone who definitely has dealt with all this for my entire life I've found it much easier to just focus on behavior and consequences and alternatives. Trying to place it all in a moral/medical framework is a black hole. If your actions hurt others or otherwise have negative results you have to address that.