I'm glad DS has his diagnosis. He's of the "high function" type that copes and masks, and most people wouldn't "see" it. But that is a cost on his emotions and energy. At 11, he's managed so far, but as he develops and society's expectations of him change at different rates he may need additional support and that diagnosis is a stepping stone for getting it. It took 15m from referral to diagnosis and fortunately it was a phase where no trauma was created. If he suddenly struggles in the teen years, the stakes of damage during 2 year waits for diagnosis are high.
I've taught or worked with kids that are displaying textbook neurodiverse difficulties/ behaviours without diagnosis, and parents that at best are not interested in that route and it obstructs being able to support appropriately. It can mean things like following standard behaviour policy rather than a more appropriate reasonable adaption that would defuse an issue.
DS would stand out anyway. His dyslexia and dyspraxia diagnoses protect him from labels like "careless" or "lazy". If he makes a social faux-pas, it's better to be "autistic" and have someone explain the nuance of the situation and ways to manage it differently, rather than being "rude".
Neurodiversity often runs in families. It can be culturally normal through the family which can cause huge blindspots in wanting to see the issue and seek diagnosis. DH doesn't "see" DS's neurodiversity in the same way that I do. To some extent he sees a repeat of his brothers and other relations... a nephew is diagnosed too...
As a physical health comparison, it's better to know you have high blood pressure and manage it, maybe through lifestyle, maybe through medication than to ignore the signs and suddenly have to deal with an accute health situation.