Neurotypical people can get stuff done even if it's of no interest to them or if they find it boring because it has to get done regardless. I've certainly had the experience of assigning something to an intern or trainee that's super boring and they just knock it out, even though they could care less about the subject of task itself.
People with ADHD have lots of difficulty with tasks or subjects that are not of interest to them, which leads to procrastination. They often wait until the last minute (often it's those people who say "I'm good under pressure"); if the consequences are serious enough, that causes them to focus on getting the task done. Pulling an all-nighter to get that report done doesn't scale and it means something else important isn't being attended to.
Dr. Andrew Huberman (Stanford neuroscientist) has an excellent podcast about ADHD [1].
[1]: https://hubermanlab.com/adhd-and-how-anyone-can-improve-thei...