Human psychology is on a spectrum. Mental disorders are extremely common, as are minor physical disorders. We aren't ashamed of seeking remedies for high blood pressure or low muscle mass or high fat, all of which are extremely common physical disorders. We shouldn't be ashamed of seeking remedies for mental disorders either.
I agree with you that most of human psychology is on a spectrum and that there is no shame in having a mental disorder or in seeking treatment for it, so I'm not sure if you're disagreeing with me or adding more information. At the same time, I think we should be cautious about suggesting to someone that they have a particular mental disorder for a behavior that is common.
A psychiatrist or neurologist would want to know significantly more about the original commenter than "Procrastination is an addiction [for me]... I've been praised for my excellent work and rewarded with raises and bonuses, even though I often procrastinate until the very last minute" before deciding that they had ADHD. That experience exists well beyond the 5% of the population that has ADHD and in my opinion is not nearly close to sufficient in the DSM-5 to suggest ADHD, particularly as even extremely severe procrastination can explained by a number of other causes.
