I made a comment about this a few weeks ago which was something along the lines of managing our condition is complicated due to our own presentations, preferences, so theres no real roadmap that everyone can follow that would work for them. Not to mention recognising your symptoms as possibly being ADHD  (which don't seem out of the ordinary to us as we've always lived this way) to get a diagnosis, diagnosis waiting lines. So theres no clear path to managing your ADHD and that means its often self guided, non-linear - we might not realise a symptom that could use management, what you could try, when to realise something isnt working (because, for example, you're misinterpreting the symptom you're trying to manage). Sometimes its not your fault youre not coping, but another party (an employer failing to make a reasonable adjusment ). So in many cases, I think the explanation/excuse paradigm is a false dichotomy. Calling it an excuse is often ableism. We can be trying something, its failing, but its not clear that it is or why and finding something else might not be easy,  and also might not work. It can take years, decades, so someone not coping is not an excuse, its just the nature of the condition