I think the difference is that it's harder (impossible-feeling) for people with ADHD to abandon the nostalgia box distraction and get back to the chore they were doing. Or, once a person with ADHD finishes going through the nostalgia box and starts coming down off that dopamine hit, it can be hard (impossible-feeling) to do anything afterwards, let alone the boring chore, leaving the person stuck in a "frozen" state.

Obviously there are different levels of severity to ADHD, and my understanding of it is colored/biased by my personal experience, I'm not a doctor, etc., but this is the difference I've noticed at least.