Sometimes people on the higher functioning end of the autistic spectrum can get a raw deal even compared to people who are low functioning, I'm not saying I'd want to be low functioning, but I will still make this point...
Very low functioning people will nearly always get help and support from the state and/or other people when needed as they are clearly totally reliant, but higher functioning autistic people are often left on their own to fail in various aspects of life and quite often don't get the right support, and in some cases they don't even get diagnosed. They are also more often misunderstood, where someone who is low functioning usually comes across as clearly disabled and allowances are normally quickly made. Both my brothers who are very low functioning are mostly happy in their own world and are looked after very well, but myself who is higher functioning has been left in various situations where I've struggled throughout my life and this often causes depression / anxiety. I don't like using the word "disability" when referring to people who are on the higher functioning end of the autistic spectrum, but if the state starts saying that higher functioning autism is no longer classed as a disability it could make the situation even worse as often much needed help and support could be cut totally (this could start happening in the UK at least and it's very worrying that it's more about saving money, but I won't say any more outside the politics forum). So maybe we shouldn't be so quick to argue that Asperger Syndrome and other high functioning autism isn't classed as a disability even if we'd rather use other words to describe it.
You said that so well. Many so-called low functioning autistics are actually highly intelligent and have high IQ scores. They just can't talk or communicate or regulate their behavior in a manner that enables them to live on their own or hold jobs or establish/maintain relationships like marriage.
I agree that even low functioning autistic people can be highly intelligent, but in totally different ways and measuring their true IQ in traditional ways would usually be impossible. Low functioning autistic people such as both my brothers may not be-able to for instance count, add 2+2, tell the time, read or write, talk properly or even at all, hold normal relationships or jobs, but people may be surprised what they can do and they still often have a special interest or interests that they can really exceed in. It is still most definitely a disability however and is in a different league to Asperger Syndrome.
My brother David can remember certain things in extreme detail from many years ago that most people would have considered totally irrelevant and he can suddenly come out with it at the most unexpected times (he can talk, but will only do this with people he knows very well like family and only they can understand his voice). He is extremely good at art / drawing and spends many hours doing this, he is also surprisingly stunning at controlling a football which is unusual since normally co-ordination and motor skills is impaired with autistic people, it's a shame he wouldn't ever be-able to understand the rules of football or be-able to interact with others (Football in the UK is known as soccer in the USA). He analyses many situations in detail and often knows exactly what is going on when people underestimate him, normally he will only mention it if something is bothering him however, E.g. if there's a threat of change, then he will go on and on repeatedly about it, sadly you could try to reassure him 100 times and it still wouldn't be enough and eventually it can cause a meltdown where he will scream, growl and bite his finger, throwing himself about.