I'm sorry for all the people on here posting about difficulties some of them horrendous that their children or they are suffering and that is, at least in part, due to ASD. I think it is valid to say you hate all the difficulties autism has brought into all of your lives and no-one should be able to take that away/invalidate that experience.
I have 3 children with (hf?) autism (although only 1 (the boy) currently has a diagnosis the 2 girls present very differently but I am positive I would get a diagnosis for at least one of them if I went private).
For two of my children (DS and DT2) it has not really been a problem at all - for DS in fact it seems to be the least problematic. He is a rather interesting little chap, handsome with a lovely smile and a fabulous imagination who is happy and popular (although struggles to communicate with anyone he doesn't know and can only really talk about certain subjects and his language is still quite delayed in lots of ways). He never melts down and although he is sensory seeking seems to manage this well and doesn't get overload. He is learning and doing well enough at school at the moment (mostly behaves himself although is a bit fidgety I guess). I doubt he will ever be a high-flyer but I think all will be fine in the long run (he's quite young so hard to know for sure just have to feel optimistic).
DT2 slow processing but doing about average at school. Social difficulties, says weird stuff (has never really made sense even though she was an early talker), seems to prefer being on her own at times but people like her, I like her, she's sweet and very honest and doesn't try to impress people, very much has her own moral code and seems happy in herself most of the time (no sensory issues that I am aware of although terrible bowel issues which I'm sure are autism related). I know she is going to be fine.
DT1 on the other hand is the brightest, healthiest, most articulate of the 3, on the surface quite sociable not to mention a bit of a stunner who is good at sport, drama, schoolwork, singing. She is a bundle of anxiety, is very violent (although only at home where people can't see), her anxiety stops her from doing well at anything (she would rather not learn something, pull out or deliberately muck up an exam than try and (in her mind inevitably) fail.) She smashes up my house regularly, refuses to do any simple tasks she is asked (PDA type autism I think), has terribly sensory overload, is very cruel to her siblings and threatens suicide regularly. She is also deceitful and manipulative. She also has ADHD I am sure (never stops jumping). I hate the behaviour (not the jumping the violence and the meanness) although I love her (we are working to get it under control with therapy but is difficult as she masks completely at school). I do worry about her all the time and would love to get rid of the anxiety and self-esteem issues as when she is relaxed she is equally as sweet and loving as my other two ASD kids, she just struggles more with being different and I can't seem to communicate with her in the same way.
That's how autism is for us. Its not awful, its just who they are. I wish i'd understood about it earlier with DT1 as then I would have been able to support her rather than think she was just naughty. I appreciate that none of them are experiencing the same things as your children. There is no shit-smearing anymore (stopped when DS was 4) and I think they will all be independent when older although it may take longer.
I am pro-choice (or at least I thought I was) but I am desperately hoping that a pre-natal screening test for autism is never developed as the end result will be the decimation of a significant and important part of our community (no-one is going to read threads like this and think, oh I'm up for a bit of that shit-smearing, violence, social isolation, most people are naturally going to play it safe in the way they do as a result of the screening for Downs).