Oh wow you made great post!! No no, you actually did say the right things!!
And not only that, what I ask is NOT to simplify common use of English (Because as the post above of user said, it helps vocabulary also) and it is never something I am against of. However, what troubles me is the techno..babble! That! yeah! The, how do I say this, When they try to explain, for instance, many times they make WOL make option "Oh it's that <solution>" which has .... answers where I am like... "What is that" then that is an issue, there have been so many times I couldn't relate. And I do not mean the entirety of English.
As I have stated, it is NOT the slang or Urianger either (I love Urianger's English and Pirates!) Because, strangely, and this may be exclussively me only in this case, it makes it easier for me to pronounce in my head (lol!) but, no, those are 100% never an issue, I love them, they better stay (they do this in Japanese too!)
However, for instance, they use words that, are unnecessarily 'expensive vocabulary' this often happens, when they try to explain the source of issues, or they explain the whole theory behind something, those moments. So I do not talk about, for instance, "Pray return to the Quicksand" this type of English I have come to love (and it also became a meme for a reason!) So, I think I have also explained it a bit excessive because I do not know how to explain it. However, I also have autism, the fact I CAN speak more than 1 language I didn't learn but grow up to know them (not fluent in a weird way) then English, I learned through school/games, so I consider myself very blessed, but then it becomes frustration when I cannot understand what the story is telling (especially under those circumstances they explain) and begins to cause anxiety. I do not know how to communicate this part, but I hope it offers more explanation, and I had heard of this, from many, so I decided, I take a step to try explain my situation to forum. but, I am happy your post explains for me too, thank you!