There are commonalities. IIRC, a diagnosis of autism requires significant impairment in all three of, and severe impairment in at least one of: - social skills

There are commonalities. IIRC, a diagnosis of autism requires significant impairment in all three of, and severe impairment in at least one of: - social skills - communication skills - rigidity (reliance on routine) That doesn't stop a wide variation in how those manifest in individuals, nor make the diagnosis meaningless.