I think getting ADHD isn’t special or interesting at the population level—when you aren’t face to face with it—but it certainly matters to individuals. I wanted to believe I was just being a human, but the reality is that I don’t have a typical human experience. I have a lot of overlap with everyone I know, but most people I meet genuinely can’t understand the experience at all. However, they are often confident that they get it. Meanwhile, they would not qualify as disabled on cognitive assessments.
To me that’s the big difference. People with ADHD often carry around legitimate, often hidden disabilities. Usually more than one.