yeah when we feel anxiety, we focus on the possible unpleasant future. if we continue to focus on something unpleasant over a long period, the fear raises body tension as we prepare for the eventual arrival of the undesirable event. At the lower end of the spectrum, we sometimes experience worry, which can entail a certain amount of flexibility. Even at that level of anxiety, though, our ability to think flexibly tends to lose. Finally, at the extreme level, we experience immobilizing, frozen terror.
so you're absolutely right, I believe you can apply some of these principles to non-autistic individuals, as their is considerable overlap across the board.
but what's unique about autistic individuals is that they express dominant tensioned emotions, making their body and emotions rigid....but they exhibit this also in a calm state. they always tend to focus on their particular stimulation, and ignore what people are doing. a young autistic would thus barely learn from others and not learn social skills. fundamentally, they do not have interest in social interaction. when they learn social skills, they only gain them "mechanistically" or only a part of them. but even when they start to develop an interest in people, they can only focus narrowly on one aspect of people's behavior and conversation, thus having difficulty understanding the entire message
this post wasn't meant to demonize autistics, sorry if it came off that way. it was actually meant to give greater insight into it and to help break out of the hell prison of their mind, since so many people can hardly grasp what it is beyond superficial descriptions that are available. the majority of this world was designed for "normal" "neurotypical" individuals, so unfortunately there will be no empathy for autistics. the only thing that they can do is adapt the best way that they can using whatever tools are available to them, and put themselves in an environment where they can somewhat thrive in an ugly world with thoughtless psychopaths that try to abuse them.