A guy who questioned me the differences between states... And my own answer.
To be autistic, and lose anxiety only loses the concept of constant fear and worry. It'll only lose the automatic state of panic, of fight and flight dramatically.
It does not mean immune. More than ready, yes, but not immune. As the state of anxiety reduced to a mere state of mind -- a part of human ups and downs, and temporary -- and not a part of daily life nor something to be manage, nor fight on daily basis.
The lack of anxiety does not gain more social skills -- what it gains, however, is the guts to try it again with little worry about 'messing up' or ever lessen the chances of emotionally breaking down.
Therefore, more data can be reached, and more 'chances' taken.
The lack of anxiety does not gain sensory filter nor desensitizes -- it gains, what it may call a 'threshold' to take more stimuli, in terms both quantity and intensity.
It'll even give more chances to have a wider range of comfort zones than the norm if one knows how to work with it.
The lack of anxiety does not relish you of repetitive actions and thoughts. The main difference is that anxiety had to do with worry -- either clinging on problems, or clinging in hope.
The repetition without anxiety, isn't mostly out of need nor out worry -- but out of pleasure, out of curiosity, out of drive to settle and finish things off -- and not merely coping nor seeking solace out of predictability.
The lack of anxiety does not gain you the sync and drive that NTs taken for granted. You will still experience constant chaos, still out of sync, and will still be different in perception and cognition. Regardless of upbringing, and regardless of past experiences.
The main difference is that without anxiety, you can take the chaos, the unpredictability, the lack of control of things -- to be able to take it as it is. To change and take charge is a choice whether out of preference or drive, not a need nor an obligation of self or another.
The lack of anxiety does not gain you a sensory/emotional/mentally self-regulating body -- because you're still autistic.
Your executive functioning is still as crappy, your body language and tone is still as odd, and language and communication is entirely up to you.
You don't gain extensive vocabulary, good grammar, and more precise speech -- you will, however, gain confidence and that's it. And your socio-emotional remains the same, still as delayed, and still as slow growing.
If you're diagnosed as autistic, then no longer have any form anxiety, and start gaining things that NTs would have, and losing autistic traits and symptoms -- you better start questioning if you're autistic to begin with, and being held back by anxiety alone.