I read recently that part of the explanation why Homo Sapiens exist today and Neanderthals, who Homo Sapiens interacted with and potentially bred with, do not, is that Homo Sapiens had (have) better cooperation skills. Cooperation and interaction with others is key to society from soup to nuts. In tribal systems, each individual has to pull their weight to hunt, gather, cook, raise children, maintain shelters, etc. You couldn't wander off for 72 hours to inventory leaves without getting eaten by something or left behind. Therefore, selection for gregarious "neuro-typical" types we see today won the genetic race. Today, obviously, I can't get a fucking latte without interaction and cooperation with the barista. Our nature is still selecting for the outgoing cooperators.
So yeah, perhaps Autism IS rooted in our ancient history and our DNA. It still crops up but the dominant trait is to NOT be on the spectrum. Those people are the ones that win at natural selection. At the risk of sounding completely insensitive, can we please stop celebrating a genetic failure that pollutes our gene pool? Personally, I don't give a shit what happens to the human race either way because I have chosen not to breed, but seriously, Darwin wants the Autards gone.
Sorry if I offend, I'm having a lousy day dealing with a painful injury.