Absolutely agree with this.
Most of us think that our minds are much like everyone else's, as I think we all do , broadly. That's precisely why we hate ourselves so much - because WHY can't we do what everyone else can do so easily?
It's only when something happens to bring to our notice the details of how ND brains differ that we recognise ourselves in the criteria. It's often our child being diagnosed via schools with much greater awareness of the signs, especially for girls.
Then we look down the list of signs and literally, tick, tick, tick, tick - oh shit my whole life becomes clear.
It's incredibly frustrating and upsetting to hear that people think it's bullshit. As I said, many of us have carried terrible self-loathing for our whole lives, not understanding why we are bright (sometimes seriously so) and yet cannot bring our intelligence to bear on anything in a sustained way. We feel like utter failures, many of us.
Being diagnosed often leads to a period of real grief - for our younger selves as children, teens, and then adults, and all the shame and guilt we felt for letting our parents, then teachers, then tutors, then bosses down. Their endless disappointment, and the misery of self-recrimination we put ourselves through.
If I'd known then what was 'wrong', I would never have put myself in situation after situation where I was absolutely predestined to fuck up, and hate myself for doing so.
So. Lucky you, that you haven't had this experience of late diagnosis; but also poor you, that don't have the imagination to consider that your own experience is not the model for all.