It can be useful, in that many neurodivergent people suffer from similar reactions from neurotypicals, and a similar lack of understanding and support. But it does nothing for the specific problems of any one type of neurodivergence, no. Consider it more of a catch-all, like how LGBT is also grouped for having similar struggles in society despite the T being quite different from the LGB part.

I've had friends compare the vagueness of neurodivergant to the vagueness of being "queer" (i.e. LGTBQ+)

it's a generic catchall that tells a listener that there's something there without having to share details you might not be comfortable with/ they might not want to get lost in the weeds over.

I figure there's a valid use case for a catchall generic term

Is it really even divergent when such a huge population has something that makes them diverge from the norm? At that point, isn't being abnormal... normal? 🤔

Like, just for an example, if 60% of the population had ADHD, they're the norm, so the neurotypicals would be the weirdos who are different.