Strip it down and the agreement is large. Both sides want the person functioning, contributing, and not leaving others to quietly carry them. Neither one actually wants a struggling person crushed under "just try harder," and neither one wants a capable person coasting on an explanation nobody ever checks.
So the fight is not "real condition" against "moral failing." Those are two different mechanisms for one observable thing.
"Lazy" and "executive dysfunction" describe the same missed task with opposite causes. One is a motivation gap: the person could start and doesn't, because it doesn't matter enough. The other is a capacity gap: the person values it, intends to, and can't reliably get the brain to initiate or sustain. Same empty sink, two machines. That's the load-bearing belief, and here's why it carries the whole argument: the fix is opposite for each. If it's motivation, accountability and consequences work. If it's capacity, consequences mostly pile on shame without building the missing function, and what actually helps is external structure and scaffolding. Treat a capacity problem like a motivation problem and you make it worse. Treat a motivation problem like a capacity problem and you enable it.
Which means the real question isn't moral at all. It's diagnostic, and it's answerable. Does the person also fail at things they clearly want to do? A motivation gap tends to spare what matters to them; a capacity gap doesn't. Does scaffolding close the gap, or does only the threat of a consequence move them? Russell Barkley's work reframed ADHD itself as fundamentally an executive-function and self-regulation problem, not a motivation one, precisely because the deficits show up even where the desire is obvious. The honest fight is figuring out which machine is running in this specific person.