For me, it's like, I have a lot of knowledge about computers, because I do a lot with computers.

And I do a lot with computers, because they don't overstimulate me like going to parties/events/whatever.

I do imagine, there's other factors involved, too. Like, I'm able to memorize things really well and probably able to think more rationally, which makes me good at computers to begin with, but I'd still have a lot of knowledge about computers and not a lot of knowledge about all the social stuff.

Independently, I also happen to have chronic fatigue+pain. It meant that I spent even more time doing things with computers.
And yeah, that one I've thought harder about. What if I do go to the doctor and they make it disappear. Would I become a different person?

Probably the same answer. I might lose my hyperfocus and pick up more interests over time, but I'd probably still do a lot with computers. I've got hardly any other hobbies now and still far too little time for all my computer side-projects.