Do you not agree that all those things you have listed can be addressed by social change?
From my experience, masking or not I simply get tired in public. Mostly when there's a lot of talking and noise. The only way to fix my public anxiety/exhaustion is genocide, which is obviously not a suitable option. The better option is for me to live in an area with lower population density, which I am free to do. Same is true for work. I never worked in "cubicle hell" but I did work in places with 5-6 people in a single room. In hindsight I should have found work such after-hours janitor or night time security guard.
Eye contact and whatnot simply doesn't cause anxiety for me. I don't fidget in public, for all I know I have always acted normal enough from age 8 or so from being taught very strictly what was "weird" to do in public and what wasn't and as I got older I got better at it. These days I don't even know how to stim when nobody is around, apart from pacing and rubbing hands. I don't even do those things at home on my own now since I did have gfs and I just didn't want to bother having the "Autism talk" and preferred to behave normally. Never caused anxiety for me, I got my rest when they were at uni or work and that was enough.
So I have a lot of doubt as to whether acceptance would actually fix anxiety, a lot of people are anxious about not being accepted. Being a social outcast is not something reserved for Autistics. Plenty of normal guys branded as "Nerds" are outcasts as well, as well as physically unattractive people. Many things that Autistic people see as unique to them is probably more widespread among the general population than they think. I think rather than social change, doing those things that normally make you anxious over and over again should technically reduce anxiety over them. It works for me, but elsewhere in the forum someone said that it hasn't worked at all for them. In the end, even if you are accepted as you are (such as physically unattractive people), it isn't going to improve your life.
There were situations where I did something strange or weird at work. I simply explained it's because of my Autism and that I would try to do better in the future. What got me fired over and over was 1 rotten apple in the pack. Back then they were not as prevalent as now but they were all "Look at me I'm so liberal"-types that would get me fired. All of them women. They cared about every social injustice out there, but not as much as they did about not having to deal with an Autistic guy at work. In hindsight it turned out very well for me thanks to this, but that isn't the typical result.
I can try to start a movement to get all liberal women fired, but it isn't realistic. The realistic way to handle it is to arrange my life so that I don't run into these issues. I can either attempt to change the whole world around me or I can move myself into a place where I fit without issues. All of modern social justice is based around changing the whole world when someone could simply change themselves in order to find a place where they can function. You want 98% of the world to completely change according to 2% of people? And then another 1% or 2% shows up and they want everything to change according to their needs. And then another 2%... and another... and another. And then one of the 2% groups has opposed needs to those of another 2%. What will you do then? You just can't have it all.
The change for yourself is rather than educating the whole world about lack of eye contact or fidgeting, simply educate the ones around you.
Simple social change is not going to make everyone's life great all of a sudden. Even if everyone is "educated" the vast majority of people are not going to want to deal with you, they'll deal with you at work because they have to but other than that if they don't like you now they won't like you then. You cannot fight brain structure and million year old social cues with social change. Fidgeting, stimming, looking away and various other things that you might do if you have Autism are extremely unnerving and uncomfortable to most NT's. They don't think you are "weird" or "creepy" because gosh darn you have Autism and that makes you a terrible person, it's because their brain is programmed to sound the alarm whenever you do these things. Some can deal with this and just ignore the alarm, but others cannot and will do whatever they can to get away from you.
Nobody is interested in strapping you down like that guy in A Clockwork Orange and "fixing you". Some people don't want to have an Autistic child and that is their choice to make. Some Autistic people will want to take a cure when it's there, and most will not. Things will just be the same as they have always been, only now there is a way out if you want. It would also fix any issues with the few ABA clinics that operate like it's the Soviet Union, since Gene therapy would make ABA obsolete. It's the only thing that can make everything better for everyone.