The diagnostic categorisation for autism is so broad that families of profoundly autistic children are being left behind, says the mother of a 7-year-old nonverbal daughter. When I tell strangers that my daughter is autistic, their questions are often so far from my reality, it’s painful. Does she have a unique talent? Special interests? They picture a child who excels at puzzles. But my daughter hasn’t shown an interest in toys since she was 20 months old and is unable to tell me what she wants to be for Halloween or when she grows up. I fear illnesses like strep...