The symptoms cluster together and are related. Someone with sensory issues is also likely to have food aversions, for example.
It's also useful for diagnostics and treatment. It means you don't have to fight insurance as much or need rediagnostics to get needed therapies. I don't need to get my child with food aversions, speech delay, and sensory issues a new diagnosis for each just because some people with autism don't have those issues.
It's also useful for diagnostics and treatment. It means you don't have to fight insurance as much or need rediagnostics to get needed therapies. I don't need to get my child with food aversions, speech delay, and sensory issues a new diagnosis for each just because some people with autism don't have those issues.