I don't see Seven as ASD coded. She has levels of trauma that can sometimes be mistaken as ASD and has lived outside of regular human society for much of her life.
You're completely right, there is obviously no deeper meaning to presenting a character who is a mature adult yet requires structured classes in order to learn how human beings socialise.
Im guessing based on your username this character is an obsession of yours, and there's a need to insist your interpretations are absolute fact. But unless the writer's state explicitly what they were intending with her character. Its all just opinions.
On another note. Despite what you might think based on a lot of comments, it is possible to discuss things on the Internet without being unnecessarily smug and condescending purely because someone contradicted your head cannon
Agreed, but terrible bedside manner isn't indicative of autism. And the Doctor seems to be garden-variety crotchety, which makes sense given that he's modeled on Lewis Zimmerman. I'd need other criteria to convince me he's supposed to be autistic.