The problem is that it's a matter of degree. Like another comment mentioned, having some wine every few months isn't being an alcoholic. Being distracted someti

The problem is that it's a matter of degree. Like another comment mentioned, having some wine every few months isn't being an alcoholic. Being distracted sometimes is completely normal, being distracted too much is a disorder. So it has to be a line you draw somewhere. And it's not like you can just count them or something. It's not like you can say "5.2 distracto-particles is normal, but 5.3 distracto-particles is ADHD". And traditionally, "too distracted to hold a job" is a common place you might draw the line between "normal" and "ADHD". So yeah, you might have to draw the line somewhere arbitrary, but that doesn't mean that the thing it's trying to measure doesn't exist. Any line you draw between "short" and "tall" will be arbitrary, but that doesn't mean height doesn't exist.