Except autistic people are different in specific, objective ways as a whole from most of society that results in confusion and ostracism. Further, society usually tries to convince them that this isn't the case: they're merely normal people that are insensitive, weak, anti-social assholes. Or something like that.

Validation that one's brain really is wired differently than most with specific strengths and weaknesses is useful information. Lets that person chart a more effective path forward accepting their weaknesses rather than believing a lack of effort or whatever. The ability to send a link to people in the majority category explaining it to them and from qualified people is even more valuable. Sometimes, when people around understand, they change their reactions and how they associate with that person to work with the strengths and around the weaknesses.

All in all, getting a diagnosis like this must have been a relief for her which validated the coping choices she made plus led she and her husband on a discovery process that will continue improving their lives. Most people don't need it. People whose brains are hardwired in ways that puts them at the mercy of tyrannical majority do.

And in my opinion, one of the key moments of growth is when you finally realize that it's not just you.