If you tried to quantify different people's experience of autism you could maybe compare people by the amplitude of their symptoms (say a maximum or average), but you'd get a much better idea of the range of experiences with something like a Fourier transform. Imagine different symptoms are different wavelengths of light. Different people experience certain elements of the constellation of symptoms that we can "autism" to different degrees. And the goal is not really to get anyone to be "less autistic", but to help them live in society (or to build a society that allows them to better join in).