While some autists are capable of genius-level work in some capacities (i.e. the so-called idiot savants), they are generally crippled when outside the scope of the thing(s) they are good at.
Most of the ones that seem to be some sort of miracle workers are generally high functioning, but are usually haunted by things like social awkwardness, lack of empathy, OCD, or other issues that are not obvious when you see them in their element.
It's likely that many geniuses throughout history were on the spectrum, but that doesn't mean they had anything resembling a normal, healthy life. Look at Mozart- unmistakable musical genius, but completely unable to manage his life, family and finances- he only got by because he never stopped pounding out high quality marketable music at a blinding pace- he also seemed to descend into drug and alcohol abuse, and eventually died a pauper, despite producing the equivalent of every John WIlliams film score ever written several times over without the help of modern technology. Jamie Hyneman (from the Mythbusters) is a wizard at building things and coming up with weird contraptions to solve even weirder problems- but he's very anti-social and hated being on camera (hence why he brought in the very extroverted Adam Savage to make their hit show work. Nikola Tesla was a real-life mad scientist working with ideas way ahead of his time, some of which we still have not caught up with- but he was also completely unable to manage his personal life and finances, and ended up getting railroaded into poverty by the business-savvy Thomas Edison, who was probably only half the inventor that Tesla was (and that's not a dig on Edison, but a compliment to Tesla). Many of today's wealthiest businessmen are probably on the spectrum- but are typically completely obsessive workaholics with almost no human empathy who are good at being sharks in the business world, but basically have NO other life. (Look at Bill Gates, now that he's retired all he can do is obsess over making people eat artificial meat, and try to convince people to reduce the population like some supervillain)
OK so TL;DR - it may seem like a superpower in some cases, but there's a cost, often a heavy one. Autism that becomes genius generally equates to a difficult , unhappy, and completely abnormal life. At best, these are people who can succeed wildly at a very limited focus of things, at the expense of everything else that makes up normality.