General doesn’t mean it applies to literally everyone. If autism turns out to be a specific condition that is e.g. the result of abnormal neuron pruning during early development, it could have a wide array of symptoms, but that understanding may someday lead to genetic treatments for sever cases, better early childhood interventions, etc.

I do think that the current ASD umbrella as written in the DSM is so broad as to seem nearly meaningless when take in isolation. It’s not meant to be in isolation however, it’s defined first and foremost as a disorder, so the symptoms need to cross some threshold of tolerable. It’s also associated with a growing body of research as to how nervous system development can cause related clusters of symptoms.

Is autism as we understand it scientifically accurate? Probably about as much as anything hovering in the intersection of social sciences and medicine. It does have some predictive power. If you meet the diagnostic criteria for autism you are likely to have certain comorbidities for example. Having certain autistic traits are good predictors of certain outcomes later in life. And we do have better therapies especially for young people than we have in the past.

The fact that people can have non-overlapping clusters of traits and still be autistic does seem problematic. It may not be the right model. Just my $.02, I’m not the autism researcher in this convo, but I am autistic :)