I wonder whether much of the difference in severity of autism symptoms, rather than being differences in the underlying condition are explained by differences i

I wonder whether much of the difference in severity of autism symptoms, rather than being differences in the underlying condition are explained by differences in comfort. Symptoms used to differentiate sever cases such as irritability, inattention, repetitive behaviour, mood changes, sleep disruption, and hyporeactivity are all exhibited by neurotypical people when in pain / discomfort / stress. A core feature of autism is sensory abnormality, so perhaps the symptoms present in severe cases can be explained by increased sensitivity to these negative internal stimuli. Additionally, I think it's important to note that we would discount many of these symptoms from a diagnosis, if a more observable and salient cause (e.g. an itchy skin condition) were seen. Gastrointestinal discomfort being poorly observable creates a bias.