In some ways it's getting harder to dx ASCs because as time goes on, the clinical and research communities are starting to realize just how BROAD the spectrum is and that it really isn't a discrete entity where one person is definitively autistic and the next person isn't. It's more like one end of a human bell curve, which is a continuum with no clear line of delineation between "is" and "isn't".
Nowadays when people starting debating what is and isn't particular to autism, what defines the conditions, I tend not to take part since behaviorally there's no all-or-nothing-at-all difference.
I do know I tend to get along better with people who are more towards the autistic side of the bell curve.